10.3886/ICPSR08051.v1 United States Department of Commerce. Bureau of the Census Inter-university Consortium for Political and Social Research 1984 census data counties demographic characteristics ethnicity household composition housing minor civil divisions population Metropolitan Statistical Areas states (USA) zip code areas 1984-06-28 1992-02-16 census/enumeration data 8051 1 This data collection relates ZIP codes to counties, to standard metropolitan statistical areas (SMSAs), and, in New England, to minor civil divisions (MCDs). The relationships between ZIP codes and other geographical units are based on 1979 boundaries, and changes since that time are not reflected. The Census Bureau used various sources to determine ZIP code-county or ZIP code-MCD relationships. In the cases where the sources were confusing or contradictory as to the geographical boundaries of a ZIP code, multiple ZIP-code records (each representing the territory contained in that ZIP-code area) were included in the data file. As a result, the file tends to overstate the ZIP code-county or ZIP code-MCD crossovers. The file is organized by ZIP code and is a byproduct of data used to administer the 1980 Census. Variables include ZIP codes, post office names, FIPS state and county codes, county or MCD names, and SMSA codes.