ICPSR County Codes: 1850-1930
This page lists the codes used in the variable COUNTY, which employs the coding scheme of the Inter-University Consortium for Political and Social Research (ICPSR). The first 3 digits are identical to the FIPS county codes used in other datasets; ICPSR adds a digit to accommodate change over time (generally, if a county merged with another or was renamed before 1970, it receives a fourth digit of "5"). A full list of ICPSR County Codes can also be downloaded as an Excel file or as tab-delimited text.
|1850 Boundary Files||1860 Boundary Files||1870 Boundary Files|
|1880 Boundary Files||1900 Boundary Files||1910 Boundary Files|
|1920 Boundary Files||1930 Boundary Files|