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Uniform Crime Reporting Program Data: County-Level Detailed Arrest and Offense Data, 2009 (ICPSR 30763)

Principal Investigator(s):


This data collection contains county-level counts of arrests and offenses for Part I offenses (murder, rape, robbery, aggravated assault, burglary, larceny, auto theft, and arson) and counts of arrests for Part II offenses (forgery, fraud, embezzlement, vandalism, weapons violations, sex offenses, drug and alcohol abuse violations, gambling, vagrancy, curfew violations, and runaways).

Series: Uniform Crime Reporting Program Data Series

Access Notes

  • These data are freely available.


DS0:  Study-Level Files
DS1:  Arrests, All Ages - Download All Files (3.5 MB)
DS2:  Arrests, Adult - Download All Files (3.5 MB)
DS3:  Arrests, Juveniles - Download All Files (3.1 MB)
DS4:  Crimes Reported - Download All Files (1.9 MB)
DS5:  Allocated Statewide Data for Arrests, All Ages - Download All Files (2.9 MB)
DS6:  Allocated Statewide Data for Arrests, Adults - Download All Files (2.9 MB)
DS7:  Allocated Statewide Data for Arrests, Juveniles - Download All Files (2.8 MB)
DS8:  Allocated Statewide Data for Crimes Reported - Download All Files (1.7 MB)

Study Description


United States Department of Justice. Office of Justice Programs. Federal Bureau of Investigation. Uniform Crime Reporting Program Data: County-Level Detailed Arrest and Offense Data, 2009. ICPSR30763-v2. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2014-06-16.

Persistent URL:

Export Citation:

  • RIS (generic format for RefWorks, EndNote, etc.)
  • EndNote XML (EndNote X4.0.1 or higher)


This study was funded by:

  • United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics

Scope of Study

Subject Terms:   aggravated assault, alcohol, arrests, arson, assault, auto theft, burglary, counties, crime rates, crime reporting, crime statistics, drug abuse, embezzlement, forgery, fraud, illegal gambling, larceny, law enforcement, murder, offenses, rape, robbery, sex offenses, Uniform Crime Reports, vagrancy, vandalism, weapons offenses

Smallest Geographic Unit:   county

Geographic Coverage:   United States

Time Period:  

  • 2009

Date of Collection:  

  • 2009

Unit of Observation:   county

Universe:   County law enforcement agencies in the United States.

Data Types:   aggregate data

Data Collection Notes:

Two major changes to the Uniform Crime Reports (UCR) county-level files were implemented beginning with the 1994 data. A new imputation algorithm to adjust for incomplete reporting by individual law enforcement jurisdictions was adopted. Within each county, data from agencies reporting 3 to 11 months of information were weighted to yield 12-month equivalents. Data for agencies reporting less than three months of data were replaced with data estimated by rates calculated from agencies reporting 12 months of data located in the agency's geographic stratum within its state. Secondly, a new Coverage Indicator was created to provide users with a diagnostic measure of aggregated data quality in a particular county. Data from agencies reporting only statewide figures were allocated to the counties in the state in proportion to each county's share of the state population.

In the arrest files (Parts 1-3 and 5-7), data were estimated for agencies reporting zero months based on the procedures mentioned above. However, due to the structure of the data received from the Federal Bureau of Investigation (FBI), estimations could not be produced for agencies reporting zero months in the crimes reported files (Parts 4 and 8). Offense data for agencies reporting one or two months are estimated using the above procedures. Users are encouraged to refer to the codebook for more information.

No arrest data were provided for Florida. Limited arrest data were available for Illinois. Limited offense data were available for Alaska, Illinois, Mississippi, Montana, North Dakota, and South Dakota.

UCR program staff at the Federal Bureau of Investigation (FBI) were consulted in developing the new adjustment procedures. However, these UCR county-level files are not official FBI UCR releases and are being provided for research purposes only. Users with questions regarding these UCR county-level data files can contact the National Archive of Criminal Justice Data at ICPSR.


Mode of Data Collection:   self-enumerated questionnaire

Extent of Processing:  ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:

  • Standardized missing values.
  • Performed recodes and/or calculated derived variables.
  • Checked for undocumented or out-of-range codes.


Original ICPSR Release:  

Version History:

  • 2014-06-16 Variables INDEX and MODINDX are replaced with VIOL and PROPERTY in Part 4; SINDEX and SMODINDX are replaced with SVIOL and SPROPERTY in Part 8. Notes are added to the codebook on these variables.
  • 2012-01-25 Minor edits were made to the documentation.

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