The U.S. Census Bureau created ZCTAs in order to provide approximate area representations of the United States Postal Services (USPS) ZIP Code service areas. The ZCTAs are NOT the same as the U.S. Postal Service Zip Codes in that ZCTAs follow census block boundaries. In contrast, U.S. Postal Service ZIP Codes serve addresses with no correlation to census block boundaries; therefore, the area covered by a ZCTA may include mailing addresses associated with ZIP Codes that are not the same as the ZCTA.
For more information on ZCTAs visit the U.S. Census Bureau's website at: https://www.census.gov/geo/reference/zctas.html
View maps of the United States Postal Services (USPS) ZIP Codes at this page: Zip Code Boundary Area Files
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