ZIP Code Tabulation Areas census.gov ↗
Free Census Bureau approximations of ZIP Code areas, published as shapefiles.
OtherData & analyticsgeodatacensuszip-codes
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USPS now offers official ZIP Code boundary polygonspostalpro.usps.com ·
Free and close enough to the USPS data for most analysis.
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Link from a commenter, not checked or endorsed by us: ↗ https://www.census.gov/programs-surveys/geography/guidance/geo-areas/zctas.html


















