Summary
Each geographic entity listed in this collection is identified by a unique two-character state code and a five-character numeric place code. Areas of the United States covered are the 50 states, the District of Columbia, and all outlying territories with significant self-administration (American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, Trust Territory of the Pacific Islands, and the Virgin Islands). An exhaustive list is included of incorporated places, census designated places (CDPs), primary county divisions, recognized Indian reservations, and Alaska Native villages and counties. The listing also includes unincorporated places, military bases, national parks, airports, and ground transportation points. The two-character class code distinguishes over 70 entity types. Each entity is identified by the county or counties in which it is located. All categories and military bases are identified by congressional district and, in most cases, by standard metropolitan statistical areas (SMSAs). Incorporated places, CDPs, and Indian and Alaska Native areas are cross-referenced to United States Bureau of the Census files. In addition, ZIP codes are provided for all post offices.
Citation
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Subject Terms
Geographic Coverage
Original Release Date
1985-05-24
Version Date
2011-07-29
Version History
1985-05-24 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:
- Created variable labels and/or value labels.
2011-07-29 SAS, SPSS, and Stata setups have been added to this data collection.
2006-01-12 All files were removed from dataset 79 and flagged as study-level files, so that they will accompany all downloads.
Notes
Data in this collection are available only to users at ICPSR member institutions.

This study is provided by ICPSR. ICPSR provides leadership and training in data access, curation, and methods of analysis for a diverse and expanding social science research community.