County Longitudinal Template, 1840-1990 (ICPSR 6576)

Version Date: Dec 20, 1995 View help for published

Principal Investigator(s): View help for Principal Investigator(s)
Patrick M. Horan; Peggy G. Hargis

Version V1

The County Longitudinal Template is a tool that enables researchers to allow for temporal changes in the geographic boundaries of counties in the United States. These data provide a decade-by-decade account of the administrative status of each county, starting in 1990 and tracing each census period back through 1840. The first four variables are the county name, ICPSR state code, FIPS code, and ICPSR county code. These four variables allow the researcher to select the counties for the state in question. The next 16 variables are ID variables for each census year, 1990 back to 1840. The last 13 variables are boundary change flags for each census year from 1960 to 1840.

Horan, Patrick M., and Hargis, Peggy G. County Longitudinal Template, 1840-1990. Inter-university Consortium for Political and Social Research [distributor], 1995-12-20.

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Georgia Agricultural Experiment Station (S-184)
Inter-university Consortium for Political and Social Research
1840 -- 1990
  1. This collection is structured as list, or free field, data, with one case in each record. Each record has the same number of variables, but the actual record length of each line varies due to the differing width of certain variables. The maximum record length in the file is 114.


All counties in the United States.

DEMOGRAPHIC, ECONOMIC, AND SOCIAL DATA: THE UNITED STATES, 1790-1970 (ICPSR 0003) and other census collections from ICPSR



2018-02-15 The citation of this study may have changed due to the new version control system that has been implemented. The previous citation was:
  • Horan, Patrick M., and Peggy G. Hargis. County Longitudinal Template, 1840-1990. ICPSR06576-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1995.

1995-12-20 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:

  • Checked for undocumented or out-of-range codes.


  • Curation and dissemination of this study is provided by the institutional members of ICPSR, and data is available only to users at ICPSR member institutions. To determine if you are at a member institution, check the list of ICPSR member institutions, or learn more about becoming a member.