ZIP Code Tabulation Areas (ZCTAs)

Description: 

The US Bureau of the Census’ reference page on ZIP Code Tabulation Areas (ZCTA). Be sure to see the FAQ page, under the Definitions and References tab. As the Bureau explains, ZCTA and USPS’ ZIP Codes are not the same thing.

You can also download the ZCTA boundaries as ESRI Shapefiles from the site.

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