The US Department of Housing and Urban Development provides crosswalk data sets that map zip codes to Census tracts, counties, etc. and vice versa. Unfortunately these data only go back to 2010, and use different definitions (2000 Census vs 2010 Census) after a certain point, so I may have to convert these Census divisions anyway (as this question talks about).

Are there any freely available datasets that contain zip code to census tract and/or county mappings (or vice versa) going back farther than 2010? I've read of proprietary datasets that do this in journal articles, but I haven't found anything open and free.

  • I looked around t see if somebody had archived the 2000 version of the file before HUD stopped making it available. No luck. Commented Sep 11, 2014 at 19:45

1 Answer 1


although zctas and zip codes are not perfect equivalents, they are pretty close.

you can generate any conceivable crosswalk with census 2010, 2000, or 1990 geographies here:




  • It looks like these crosswalks use USPS zip codes (postal zip codes), which is what I need, not zip code tabulation areas, so this is perfect! Now I just need it for all the years in between...
    – Michael A
    Commented Sep 15, 2014 at 20:48
  • Are you sure this is USPS zip codes and not ZCTAs in the mcdc? I'm pretty sure it's ZCTAs... Commented Nov 8, 2016 at 16:34
  • mcdc has zctas not zip codes mcdc.missouri.edu/websas/maggot12.shtml#zip Commented Nov 8, 2016 at 18:08

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