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1990 PUMAs:Detailed Composition and Boundary Fileskey
to PUMA information
Detailed composition of 1990 PUMAsThese maps show the Public Use Microdata Area (PUMA) boundaries for the 1990 state (5%) and metro (1%) samples. In some states, one or more PUMAs include noncontiguous parts. These PUMAs are noted on the maps with "(part)" next to the PUMA number. Noncontiguous PUMAs occur for several reasons. On the metro (1%) sample, every effort was made to keep metropolitan and non-metropolitan areas separate. On the state (5%) sample, it was important to keep meaningful socioeconomic or planning areas together. In sparsely populated areas, it may have been necessary to delineate PUMAs with noncontiguous parts to meet minimum population criteria when the adjacent counties belonged to either a metropolitan area or local planning area. PUMAs which cross state lines appear on the State "99" File, also available on the IPUMS website. Users can locate areas by searching the file under the appropriate MSA/PMSA codes. The elderly (3%) sample has the same geographical components as the state (5%) sample. The Census Bureau equated the State Planning Service Areas (PSAs) to the state PUMAs whenever the two were equal. If the two were not equal, the PSA code is 000. * The PUMA map of Delaware has never been made available and is missing from the list. The detailed composition of the PUMA data has been broken down into state-specific tables for both the 1% metro and 5% state samples in the list above. For users who may want to analyze the PUMA composition data in a statistics package, the detailed composition for each PUMA sample is also described in two rectangular Excel files: 1% Sample PUMAs and 5% Sample PUMAs).
Boundary files for 1990 PUMAs:Two sets of nationwide Boundary files are available for download in .zip format:
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