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Crosswalks for Tabular Data

MABLE Geocorr [Geographic Correspondence Tool]
This is a geographic correspondence tool or crosswalk across various geographies such as Congressional Districts, counties, places, zip codes, census tracts, block groups, voting districts, and school districts. This is currently available for 1990, 2000 and 2010.

Labor Market Crosswalks
Commuting Zones (CZs) provide a local labor market geography that covers the entire land area of the United States. CZs are clusters of U.S. counties that are characterized by strong within-cluster and weak between-cluster commuting ties. The crosswalk files below provide a probabilistic matching of sub-state geographic units in U.S. Census Public Use Files to CZs.

PUMA to County Utility (American FactFinder)
This utility takes PUMA-based output from American FactFinder and generates county-based statistics using the correspondence between PUMAs and counties. The following example illustrates the use of this tool.

Note that PUMAs are being redrawn based on the 2010 Census. The current equivalency file is based on 2000 Census counts and will not be as accurate as it was earlier in the decade.

Census Tract Relationship files - Decade to Decade: 1970 - 2010
These are files that show the crosswalk from one census to the next for census tracts. There are files for 1970 to 1980; 1980 to 1990; 1990 to 2000; and 2000 to 2010.

Another source for this (as a finished product) are the Neighborhood Change Database and/or the Longitudinal Tract Database. In both of these cases, the data are normalized to the most recent year and across multiple decades instead of decade to decade.