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The American Community Survey (ACS) Summary File is a set of comma-delimited text files that contain all of the Detailed Tables for the ACS data releases. Summary File estimates, margins of error, and geography files for each release are available.

The Detailed Tables are stored in a series of files with only the data from the tables and without such information as the table title, description of the rows, or geographic identifiers. That information is located in other files that the user must merge with the data files to reproduce full tables. Starting with the 2009-2013 ACS 5-year data release, block groups, the lowest level of geography published by the ACS, are available at data.census.gov. For earlier years, block groups are available only in the ACS 5-year Summary File.

The purpose of the Census of Juveniles on Probation (CJP) was to collect individual-level data about youth on probation, including their numbers and characteristics. The CJP survey asked respondents to report the total number of juveniles on formal probation within their reporting jurisdiction on the reference date of October 24, 2012.

For each youth on probation, responding agencies were asked to provide the following information: sex, date of birth, race, most serious offense, state and county where most serious offense was committed, and the state and county where the juvenile resided on the census reference date.

This data collection contains the national data.

The Commonwealth of the Northern Mariana Islands Summary File contains data on population and housing subjects compiled from questions on the 2010 Commonwealth of the Northern Mariana Islands Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, foreign-born status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training, military dependents and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, gross rent, internet service, kitchen facilities, cooking facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, condominium fee, selected monthly owner costs, sewage disposal, water supply, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built.

The data are organized in 411 tables, one variable per table cell, which are presented at up to 19 levels of observation, including the Commonwealth of the Northern Mariana Islands as a whole, municipalities, election districts, villages, census tracts, block groups, blocks and 5-digit ZIP Code Tabulation Areas. Fifty tables are presented at the block level and higher, 255 at the block group level and higher and 106 at the census tract level and higher. Additionally, the tables are iterated for the urban and rural geographic components of municipalities and 21 geographic components of the Commonwealth of the Northern Mariana Islands as a whole: 15 urban components (total urban, urbanized areas, urban clusters, and urbanized areas and urban clusters of various population sizes) and 6 rural components (total rural, rural areas outside places, rural areas inside places and inside places of various population sizes).

Due to problems in the initial version, the Census Bureau ultimately issued the tables as three data products. The first or main release comprises 34 data files with all the tables except PBG7 (Nativity by Citizen Status by Year of Entry), PBG9 (Year of Entry for the Foreign-born Population) and ten tables on selected monthly owner costs, the tables HBG75, HBG76, HBG77, HBG78, HBG79, HBG80, HBG81, HCT18, HCT19 and HCT20. The second, called the Commonwealth of the Northern Mariana Islands Year of Entry Summary File, consists of two data files with the tables PBG7 and PBG9. The third is a document file with the ten tables on selected monthly owner costs. ICPSR provides each product as a separate ZIP archive. The archive with the selected monthly owner costs tables also includes additional technical documentation prepared by the Bureau.

The Guam Summary File contains data on population and housing subjects compiled from questions on the 2010 Guam Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, foreign-born status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training, military dependents and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, internet service, kitchen facilities, cooking facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, gross rent, condominium fee, selected monthly owner costs, sewage disposal, water supply, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built.

The data are organized in 411 tables, one variable per table cell, which are presented at up to 15 levels of observation, including Guam as a whole, municipalities, census designated places, census tracts, block groups, blocks and 5-digit ZIP Code Tabulation Areas. Fifty tables are presented at the block level and higher, 255 at the block group level and higher and 106 at the census tract level and higher. Additionally, the tables are iterated for 21 geographic components of Guam as a whole: 15 urban components (total urban, urbanized areas, urban clusters, and urbanized areas and urban clusters of various population sizes) and 6 rural components (total rural, rural areas outside places, rural areas inside places and inside places of various population sizes).

Due to problems in the initial version, the Census Bureau ultimately issued the tables as three data products. The first or main release comprises 35 data files with all the tables except PBG7 (Nativity by Citizen Status by Year of Entry), PBG9 (Year of Entry for the Foreign-born Population) and ten tables on selected monthly owner costs, the tables HBG75, HBG76, HBG77, HBG78, HBG79, HBG80, HBG81, HCT18, HCT19 and HCT20. The second, called the Guam Year of Entry Summary File, consists of two data files with the tables PBG7 and PBG9. The third is a document file with the ten tables on selected monthly owner costs. ICPSR provides each product as a separate ZIP archive. The archive with the selected monthly owner costs tables also includes additional technical documentation prepared by the Bureau.

The United States Virgin Islands Summary File contains data on population and housing subjects compiled from questions on the 2010 United States Virgin Islands Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, foreign-born status, disability status, educational attainment, race, Hispanic or Latino origin, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and ability to speak English, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, poverty status, residence in 2009, school enrollment, vocational training and veteran status. Housing subjects include acreage, agricultural sales, business on property, computer ownership, internet service, kitchen facilities, cooking fuel, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, purchase of water from water vendor, gross rent, condominium status and fee, mobile home costs, selected monthly owner costs, sewage disposal, source of water, telephone service available, tenure, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built.

The data are organized in 548 tables, one variable per table cell, which are presented at up to 21 levels of observation, including the United States Virgin Islands as a whole, islands, census subdistricts, places (census designated places and towns), estates, census tracts, block groups, blocks and 5-digit ZIP Code Tabulation Areas. Altogether, 110 tables are presented at the block level and higher, 288 at the block group level and higher and 150 at the census tract level and higher. Additionally, the tables are iterated for the urban and rural geographic components of islands and 21 geographic components of the United States Virgin Islands as a whole: 15 urban components (total urban, urbanized areas, urban clusters, and urbanized areas and urban clusters of various population sizes) and 6 rural components (total rural, rural areas outside places, rural areas inside places and inside places of various population sizes).

Due to problems in the initial version, the Census Bureau ultimately issued the Summary File as two data products. The first or main release comprises 50 data files with all the tables except 11 tables on selected monthly owner costs, the tables HBG66, HBG67, HBG68, HBG69, HBG70, HBG71, HBG72, HBG73, HCT19, HCT20 and HCT21. The second, supplemental release consists of a document file with the 11 tables on selected monthly owner costs. ICPSR provides each product as a separate ZIP archive. The archive with the supplemental release also includes additional technical documentation prepared by the Bureau.

The American Samoa Summary File contains data on population and housing subjects compiled from questions on the 2010 American Samoa Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, foreign-born status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training, military dependents and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, gross rent, internet service, kitchen facilities, cooking facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, condominium fee, selected monthly owner costs, sewage disposal, water supply, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built.

The data are organized in 405 tables, one variable per table cell, which are presented at up to 19 levels of observation, including American Samoa as a whole, districts (including two separate atolls), counties, villages, census tracts, block groups, blocks and 5-digit ZIP Code Tabulation Areas. Fifty tables are presented at the block level and higher, 250 at the block group level and higher and 105 at the census tract level and higher. Additionally, the tables are iterated for the urban and rural geographic components of districts/atolls and 21 geographic components of American Samoa as a whole: 15 urban components (total urban, urbanized areas, urban clusters, and urbanized areas and urban clusters of various population sizes) and 6 rural components (total rural, rural areas outside places, rural areas inside places and inside places of various population sizes).

Due to problems in the initial version, the Census Bureau ultimately issued the tables as three data products. The first or main release comprises 32 data files with all the tables except PBG7 (Nativity by Citizen Status by Year of Entry), PBG9 (Year of Entry for the Foreign-born Population) and ten tables on selected monthly owner costs, the tables HBG72, HBG73, HBG74, HBG75, HBG76, HBG77, HBG78, HCT17, HCT18, and HCT19. The second, called the American Samoa Year of Entry Summary File, consists of two data files with the tables PBG7 and PBG9. The third is a document file with the ten tables on selected monthly owner costs.

This data collection comprises a codebook and three ZIP archives. The first archive contains the 32 data files in the main release, the second the two Year of Entry data files and the third contains the document file with the ten selected monthly owner costs tables and additional technical documentation.

The American Indian and Alaska Native Summary File (AIANSF) contains summary data for Native Americans derived from the 2010 Census questionnaire. Covered population and housing subjects include age, sex, tribal affiliation (enrolled or principal tribe), household relationship, household type, household size, family type, family size, group quarters and housing tenure. The data are organized in 71 tables (one variable per table cell) which are iterated for the total population, the total American Indian and Alaska Native population alone, the total American Indian and Alaska Native population alone or in combination with one or more other races, and 1,567 detailed tribes and tribal groupings. Sixty-one tables are presented down to the census tract level and 10 tables down to the county level. Altogether the tables are presented at 76 levels of observation, including the United States as a whole, regions, divisions, states, counties, county subdivisions, places, census tracts, metropolitan statistical areas/micropolitan statistical areas, congressional districts (111th Congress), state legislative districts, school districts, 5-digit ZIP code tabulation areas, American Indian Areas/Alaska Native Areas/Hawaiian Home Lands, tribal subdivisions and tribal census tracts. In the Census Bureau's nomenclature, the population group iterations are called "characteristic iterations" and levels of observation are called "summary levels."

The AIANSF tables are also presented for geographic components of some summary levels, e.g., all federally-recognized American Indian reservations collectively within each state or the nation as a whole; all metropolitan statistical areas collectively within each state or the nation as a whole, and the principal cities of metropolitan or micropolitan statistical areas. AIANSF contains 17,271 data files: a file with geographic identification variables (the geographic header record file) and 11 files with the population and housing variables for each characteristic iteration.

Together with the data files, the Census Bureau prepared a codebook, Microsoft Access database shell and additional documentation. ICPSR provides the data files in a ZIP archive and the database shell and additional documentation in a second ZIP archive

The 2010 Census Modified Race Summary File contains modified population counts for race categories. The modification reconciles the 2010 Census race classification which includes the category "Some Other Race" with race classifications used by some government agencies which lack this residual category. Applying a method it developed, the Census Bureau assigned persons who reported Some Other Race to one or more of five race categories: White; Black or African American; American Indian and Alaska Native; Asian; and Native Hawaiian and Other Pacific Islander.

The Census Bureau prepared two comma-delimited plain text data files with the modified race counts tabulated by five-year age groups, gender and Hispanic origin for all counties and county equivalents in the United States. One file covers Alabama through Missouri (STCO-MR2010_AL_MO.csv) and the other Montana through Wyoming (STCO-MR2010_MT_WY.csv). A third file contains the modified race and original Census 2010 race distributions for the United States as a whole (totals only, not broken down by age, gender or Hispanic origin). The Census Bureau produced the third file in two data formats: Excel (US-MR2010-01.xls) and comma-delimited plain text (US-MR2010-01.xls). ICPSR bundled all of the data files in a single ZIP archive.

The ICPSR codebook for the Modified Race Summary File comprises two documents prepared by the Census Bureau: a methodology statement and record layout for the two county-level files.

The Virgin Islands of the United States Demographic Profile Summary File contains data on population and housing subjects derived from questions on the 2010 United States Virgin Islands Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, disability status, educational attainment, race, Hispanic or Latino origin, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and ability to speak English, marital status, foreign born status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, poverty status, residence in 2009, school enrollment, vocational training and veteran status. Housing subjects include computer ownership, cooking fuel, gross rent, internet service, kitchen facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, purchase of water from water vendor, selected monthly owner costs, sewage disposal, source of water, telephone service available, tenure, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built. The population and housing data are organized in 115 tables which are presented at five levels of observation: the United States Virgin Islands as a whole, island, census subdistrict, estate and place (town or census designated place). Every table cell is represented by a separate variable. The data are segmented into four data files. One data file contains geographic identification variables and the other three the population and housing variables.

Together with the data files, the Census Bureau prepared a codebook and additional documentation, a Microsoft Access database shell, and a HTML-based application for displaying the tables called the Interactive Summary Level Access and Navigation Database (ISLAND). ICPSR provides all of these components, except the codebook, in three ZIP archives. The first archive contains the data files, the second the database shell and additional documentation and the third contains ISLAND. The codebook is provided as a separate file.

The Guam Demographic Profile Summary File contains data on population and housing subjects derived from questions on the 2010 Guam Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, foreign-born status, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, gross rent, internet service, kitchen facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, selected monthly owner costs, sewage disposal, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built. The population and housing data are organized in 121 tables which are presented at three levels of observation: Guam as a whole, municipalities and census designated places. Every table cell is represented by a separate variable. The data are segmented into four data files. One data file contains geographic identification variables and the other three the population and housing variables.

Together with the data files, the Census Bureau prepared a codebook and additional documentation, a Microsoft Access database shell, and a HTML-based application for displaying the tables called the Interactive Summary Level Access and Navigation Database (ISLAND). ICPSR provides all of these components, except the codebook, in three ZIP archives. The first archive contains the data files, the second the database shell and additional documentation and the third contains ISLAND. The codebook is provided as a separate file.

The Commonwealth of the Northern Mariana Islands (CNMI) Demographic Profile Summary File contains data on population and housing subjects derived from questions on the 2010 Commonwealth of the Northern Mariana Islands Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, gross rent, internet service, kitchen facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, selected monthly owner costs, sewage disposal, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built. The population and housing data are organized in 121 tables which are presented at four levels of observation: the CNMI as a whole, municipalities, election districts and villages. Every table cell is represented by a separate variable. The data are segmented into four data files. One data file contains geographic identification variables and the other three the population and housing variables.

Together with the data files, the Census Bureau prepared a codebook and additional documentation, a Microsoft Access database shell, and a HTML-based application for displaying the tables called the Interactive Summary Level Access and Navigation Database (ISLAND). ICPSR provides all of these components, except the codebook, in three ZIP archives. The first archive contains the data files, the second the database shell and additional documentation and the third contains ISLAND. The codebook is provided as a separate file.

The American Samoa Demographic Profile Summary File contains data on population and housing subjects derived from questions on the 2010 American Samoa Census questionnaire. Population subjects include age, sex, children ever born, citizenship status, disability status, educational attainment, ethnic origin or race, family type, grandparents as caregivers, group quarters population, health insurance coverage status, household type and relationship, employment status and subsistence activity, work experience, class of worker, industry, occupation, place of work, journey to work, travel time to work, language spoken at home and frequency of language usage, marital status, nativity, year of entry, place of birth, parents' place of birth, earnings, income, remittances sent abroad, poverty status, residence in 2009, reason for moving, school enrollment, vocational training and veteran status. Housing subjects include air conditioning, battery-operated radio ownership, computer ownership, gross rent, internet service, kitchen facilities, mortgage status, number of rooms, number of bedrooms, occupancy status, occupants per room, plumbing facilities, selected monthly owner costs, sewage disposal, source of water, telephone service available, tenure, type of building materials, units in structure, vacancy status, value of home, vehicles available, year householder moved into unit and year structure built. The data are organized in 121 tables which are presented at four levels of observation: American Samoa as a whole, districts (and two separate atolls), counties and villages. Every table cell is represented by a separate variable in the data which are segmented into four data files.

Together with the data files, the Census Bureau prepared a codebook and additional documentation, a Microsoft Access database shell, and a HTML-based application for displaying the tables called the Interactive Summary Level Access and Navigation Database (ISLAND). ICPSR supplies all of these components, except the codebook, in three ZIP archives. The first archive contains the data files, the second the database shell and additional documentation and the third contains ISLAND. The codebook is provided as a separate file.

The Demographic Profile Summary File contains 23 tables derived from the responses to the 2010 Census questionnaire, including tabulations of the population by age and sex, race, and Hispanic or Latino origin; household population by household relationship; group quarters population by sex and group quarters type; households by type; and housing units by occupancy and tenure. The Census Bureau computed the tables for multiple levels of observation (called "summary levels" in the Census Bureau's nomenclature), including, but not limited to, regions, divisions, states, metropolitan and micropolitan statistical areas, counties, county subdivisions, places, congressional districts, state legislative districts, school districts, American Indian Areas, Alaska Native Areas, Hawaiian Home Lands, ZIP code tabulation areas, and census tracts. Additionally, for some summary areas the tables are iterated for "geographic components," e.g., the urban and rural portions of metropolitan statistical areas and the portions of states inside and outside metropolitan statistical areas. With one variable per table cell and additional variables with geographic information, the Demographic Profile Summary File comprises 106 data files, two per state, the District of Columbia, Puerto Rico, and the National File.

ICPSR supplies this data collection in 54 ZIP archives. There is a separate archive for each state, the District of Columbia, Puerto Rico and the National File, and an archive with a Microsoft Access database shell and instructions on how to use the shell.

The Eurobarometer series is a unique cross-national and cross-temporal survey program conducted on behalf of the European Commission. These surveys regularly monitor public opinion in the European Union (EU) member countries and consist of standard modules and special topic modules. The standard modules address attitudes towards European unification, institutions and policies, measurements for general socio-political orientations, as well as respondent and household demographics. The special topic modules address such topics as agriculture, education, natural environment and resources, public health, public safety and crime, and science and technology.

This round of Eurobarometer surveys covers the following special topics: (1)Passenger Rights and (2)Development Aid. Respondent's opinions were collected regarding their rights and experiences as passengers on board planes, rail, ship, and other public transportation means. They were asked about disruptions, delays, transportation mode, noise and assistance. Their opinions were also collected about EU development aid, poverty, and living conditions. They were asked where development aid should be used, for example, to improve health, education, water and sanitation, or a number of other areas. They were also asked where they obtained their information about development.

Demographic and other background information collected includes age, gender, nationality, marital status, left-right political self-placement, occupation, age when stopped full-time education, household composition, ownership of a fixed or mobile telephone and other durable goods, difficulties in paying bills, self-assessed level in society, self-assessed social class, and Internet use. In addition, country-specific data includes type and size of locality, region of residence, and language of interview (select countries).

This collection provides information on live births in the United States during calendar year 2013. The natality data in these files are a component of the vital statistics collection effort maintained by the federal government. Birth data is limited to births occurring in the United States to United States residents and nonresidents. Births occurring to United States citizens outside of the United States are not included in this data collection.

Dataset 1 contains data on births occurring within the United States, while dataset 2 contains data on births occurring in the United States territories of Puerto Rico, the Virgin Islands, Guam, American Samoa, and the Commonwealth of the Northern Mariana Islands. The variables include information on prenatal care, receipt of WIC, obstetric procedures, onset of labor, characteristics of labor and delivery, place and time of birth, attendant at birth, method of delivery, source of payment for the delivery, maternal lifestyle and health characteristics, and details about the infant's health characteristics.

Birth and fertility rates and other statistics related to this study can be found in the User Guide, under Detailed Technical Notes.

Demographic variables include the child's sex and month and year of birth, and the parents' ages, races, ethnicities, education levels, as well as the mother's marital and residency status.

These data include county-level, net migration estimates by five-year age cohorts and sex, and by race and Hispanic origin, for the intercensal period from 2000 to 2010. The estimates were prepared using a vital statistics version of the forward cohort residual method. These estimates (and the net migration rates derivable from them) extend the set of decennial estimates of net migration that have been produced following each decennial census beginning with 1960 (net migration for the 1950s: Bowles and Tarver, 1965; 1960s: Bowles, Beale and Lee, 1975; 1970s: White, Mueser and Tierney, 1987; 1980s: Fuguitt, Beale, and Voss 2010; and 1990s: Voss, McNiven, Hammer, Johnson and Fuguitt, 2004).

Further information about this project is available on the Net Migration Patterns for US Counties Web site.

The Congressional District Summary File contains summary statistics on population and housing subjects derived from the responses to the 2010 Census questionnaire. Population items include sex, age, race, Hispanic or Latino origin, household relationship, household type, household size, family type, family size, and group quarters. Housing items include occupancy status, vacancy status, and tenure (whether a housing unit is owner-occupied or renter-occupied). The summary statistics are presented in 333 tables which are tabulated for states, the District of Columbia, Puerto Rico, congressional districts, and areas in hierarchical sequence within congressional districts, such as census tracts, county subdivisions, places, and American Indian/Alaska Native/Hawaiian Home Land areas. There are 261 population tables and 62 housing tables shown for all levels of geography in the file and 10 population tables shown only for states, the District of Columbia, Puerto Rico, and congressional districts. With one variable per table cell and additional variables with geographic information, the collection comprises 2,548 data files, 49 per state, the District of Columbia, and Puerto Rico.

This data collection is supplied in 53 ZIP archives. There is a separate archive for each state, the District of Columbia, and Puerto Rico. The last archive contains a Microsoft Access database shell and additional documentation files besides the codebook.

This data collection contains summary statistics on population and housing subjects derived from the responses to the 2010 Census questionnaire. Population items include sex, age, average household size, household type, and relationship to householder such as nonrelative or child. Housing items include tenure (whether a housing unit is owner-occupied or renter-occupied), age of householder, and household size for occupied housing units. Selected aggregates and medians also are provided. The summary statistics are presented in 71 tables, which are tabulated for multiple levels of observation (called "summary levels" in the Census Bureau's nomenclature), including, but not limited to, regions, divisions, states, metropolitan/micropolitan areas, counties, county subdivisions, places, ZIP Code Tabulation Areas (ZCTAs), school districts, census tracts, American Indian and Alaska Native areas, tribal subdivisions, and Hawaiian home lands. There are 10 population tables shown down to the county level and 47 population tables and 14 housing tables shown down to the census tract level. Every table cell is represented by a separate variable in the data.

Each table is iterated for up to 330 population groups, which are called "characteristic iterations" in the Census Bureau's nomenclature: the total population, 74 race categories, 114 American Indian and Alaska Native categories, 47 Asian categories, 43 Native Hawaiian and Other Pacific Islander categories, and 51 Hispanic/not Hispanic groups. Moreover, the tables for some large summary areas (e.g., regions, divisions, and states) are iterated for portions of geographic areas ("geographic components" in the Census Bureau's nomenclature) such as metropolitan/micropolitan statistical areas and the principal cities of metropolitan statistical areas.

The collection has a separate set of files for every state, the District of Columbia, Puerto Rico, and the National File. Each file set has 11 data files per characteristic iteration, a data file with geographic variables called the "geographic header file," and a documentation file called the "packing list" with information about the files in the file set. Altogether, the 53 file sets have 110,416 data files and 53 packing list files. Each file set is compressed in a separate ZIP archive (Datasets 1-56, 72, and 99). Another ZIP archive (Dataset 100) contains a Microsoft Access database shell and additional documentation files besides the codebook.

The National File (Dataset 99) constitutes the National Update for Summary File 2. The National Update added summary levels for the United States as a whole, regions, divisions, and geographic areas that cross state lines such as Core Based Statistical Areas.

This data collection contains summary statistics on population and housing subjects derived from the responses to the 2010 Census questionnaire. Population items include sex, age, race, Hispanic or Latino origin, household relationship, household type, household size, family type, family size, and group quarters. Housing items include occupancy status, vacancy status, and tenure (whether a housing unit is owner-occupied or renter-occupied). The summary statistics are presented in 331 tables, which are tabulated for multiple levels of observation (called "summary levels" in the Census Bureau's nomenclature), including, but not limited to, regions, divisions, states, metropolitan statistical areas, micropolitan statistical areas, counties, county subdivisions, places, congressional districts, American Indian and Alaska Native area and Hawaiian home lands, ZIP Code tabulation areas, census tracts, block groups, and blocks. There are 177 population tables and 58 housing tables shown down to the block level; 82 population tables and 4 housing tables shown down to the census tract level; and 10 population tables shown down to the county level. Some of the summary areas are iterated for "geographic components" or portions of geographic areas, e.g., the principal city of a metropolitan statistical area. With one variable per table cell and additional variables with geographic information, the collection comprises 2,544 data files, 48 per state, the District of Columbia, Puerto Rico, and the National File.

The Census Bureau released SF1 in three stages: initial release, National Update, and Urban/Rural Update. The National Update added summary levels for the United States, regions, divisions, and geographic areas that cross state lines such as Combined Statistical Areas. The Urban/Rural Update added urban and rural population and housing unit counts, summary levels for urban areas and the urban/rural components of census tracts and block groups, geographic components involving urbanized areas and urban clusters, and two new tables (household type by relationship for the population 65 years and over and a new tabulation of the total population by race). This data collection comprises the intial release and National Update. The Urban/Rural update is available as ICPSR 34746.

SF1 is supplied in 54 ZIP archives. There is an archive for each state, the District of Columbia, Puerto Rico, and the National File. The last archive contains a Microsoft Access database shell and additional documentation files besides the codebook.

Summary File 1 (SF1) Urban/Rural Update contains summary statistics on population and housing subjects derived from the responses to the 2010 Census questionnaire. Population items include sex, age, race, Hispanic or Latino origin, household relationship, household type, household size, family type, family size, and group quarters. Housing items include occupancy status, vacancy status, and tenure (whether a housing unit is owner-occupied or renter-occupied). The summary statistics are presented in 333 tables, which are tabulated for multiple levels of observation (called "summary levels" in the Census Bureau's nomenclature), including, but not limited to, regions, divisions, states, metropolitan/micropolitan statistical areas, counties, county subdivisions, places, congressional districts, American Indian Areas, Alaska Native Areas, Hawaiian Home Lands, ZIP Code tabulation areas, census tracts, block groups, and blocks. There are 177 population tables and 58 housing tables shown down to the block level; 84 population tables and 4 housing tables shown down to the census tract level; and 10 population tables shown down to the county level. Some of the summary areas are iterated for "geographic components" or portions of geographic areas, e.g., the principal city of a metropolitan statistical area (MSA) or the urban and rural portions of a MSA. With one variable per table cell and additional variables with geographic information, the collection comprises 2,597 data files, 49 per state, the District of Columbia, Puerto Rico, and the National File.

The Census Bureau released SF1 in three stages: initial release, National Update, and Urban/Rural Update. The National Update added summary levels for the United States, regions, divisions, and geographic areas that cross state lines such as Combined Statistical Areas. This update adds urban and rural population and housing unit counts, summary levels for urban areas and the urban/rural components of census tracts and block groups, geographic components involving urbanized areas and urban clusters, and two new tables (household type by relationship for the population 65 years and over and a new tabulation of the total population by race). The initial release and National Update is available as ICPSR 33461.

ICPSR supplies this data collection in 54 ZIP archives. There is a separate archive for each state, the District of Columbia, Puerto Rico, and the National File. The last archive contains a Microsoft Access database shell and additional documentation files besides the codebook.

This data collection represents a set of United States county net migration estimates by age and sex for the 1980-1990 decade, and is part of a series of estimates done for each decade since 1950 (1950-1970: see NET MIGRATION OF THE POPULATION BY AGE, SEX, AND RACE, 1950-1970 [ICPSR 8493]; 1970-1980: see NET MIGRATION OF THE POPULATION OF THE UNITED STATES BY AGE, RACE, AND SEX, 1970-1980 [ICPSR 8697]; 1990-2000: see COUNTY-SPECIFIC NET MIGRATION BY FIVE-YEAR AGE GROUPS, HISPANIC ORIGIN, RACE, AND SEX, 1990-2000 [ICPSR 4171]).

Net migration, the difference between the number of people moving into an area and the number moving out over a period, is measured here, and in all the other sets of estimates in the series, by the residual method. That is, net migration is equal to the population change over the period minus the natural increase (births -- deaths). Full details on how natural increase is estimated for each county, as well as other details of the data collection, are described in the codebook.