Introduction to Summary Tape File 3.

This database consists of four sets of computer-readable data files containing detailed tabulations of the nation's population and housing characteristics. The files contain sample data inflated to represent the total United States population. The file also contains 100 % counts and unweighted sample counts of persons and housing units. This series is comprised of STF3A, STF3B, STF3C, and STF3D. All files in the STF3 series are identical, containing 3,300+ table cells, as well as standard geographic identification variables. Population items tabulated for each person include demographic data and information on schooling, ethnicity, labor force status, children, and details about occupation and income. Housing items include data on size and condition of the housing unit as well as information on value, age, water, sewage and heating, vehicles, and monthly owner costs. Each file provides different geographic coverage.


provides summaries for the divisions (MCDs) or census county divisions (CCDs), places or place segments within MCD/CCDs and remainders within MCD/CCDs, census tracts or block numbering areas (BNAs) and block groups (BGs) or, for areas that are not block numbered, enumeration districts (EDs), places, and Congressional Districts.


provides summaries for each 5-digit ZIP code area within a state, and for 5-digit ZIP code areas within states which are contained within SMSAs, portions of SMSAs, or within counties, county portions, or county equivalents. All persons and housing units in the United States were sampled. Population and housing items include household relationship, sex, age, race, marital status, Spanish origin, number of units at address, complete plumbing facilities, number of rooms, whether owned or rented, vacancy status, and values for noncondominiums.


is a national-level file containing summaries for the following levels: United States, census regions, census divisions, states, standard consolidated statistical areas (SCSAs), SMSAs, urbanized areas (UAs), counties, places of 10,000 or more, MCDs of 10,000 or more in eleven selected states, and Congressional districts.


provides summaries for state or state equivalent, Congressional District (as constituted for the 98th Congress), county or county equivalent, places of 10,000 or more people, and MCD/CCDs. The number of data records in each file for all 4 studies varies by state.