Zip Codes and Carrier Routes

All USPS zip code related information and carrier routes can be found here. Products include:

  • Zip Code Boundaries & Centroids
  • Zip Code and Admin Reference Table
  • Zip+4s
  • Zip+4 Centroids
  • Carrier Routes


  • Provides a quick view of specific zip code changes in a given release
  • Includes a complete zip code table for more accurate geocoding
  • Provides all names associated with a particular zip code in a separate table for faster geocoding and better hit rates in the main zip code boundary file

Is ZIP Code Boundaries and Centroids right for you?

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ZIP+4 Centroids

The ZIP+4 Centroids dataset identifies more than 60 million deliverable USPS ZIP+4s and correlates this information to US Census Block data. Because ZIP+4s represent small areas, they can more accurately identify latitude and longitude coordinates regardless of misspelled street names or scrambled street numbers. ZIP+4 Centroids is the most accurate zip code data on the market.


  • Provides address matching to complement StreetPro™
  • Creates dot density maps that illustrate market locations
  • Allows use of ZIP+4 Centroids to overlay maps created from other databases
  • Helps businesses analyze spatial relationships between current business locations, customers and competitors
  • Facilitates territory definition
  • Enables direct mail targeting at the ZIP+4 level

Carrier Routes

Carrier Routes represent the area served by a particular USPS mail carrier. Boundaries follow roads for accuracy and visual appeal. A proprietary process captures residential and business routes, creating a great resource for direct marketers.

A single record is created for each carrier route feature, regardless of the number of polygons that constitute it. Such “split routes” still contain all the necessary information to draw each polygon. The centroid file for split routes uses the gravity center point of the carrier route to ensure that that the centroid resides within one of the carrier route polygons.


  • Multiple data feeds, including USPS data, make this the most complete dataset of its kind.
  • CASS certifiable data is imported each month.
  • ZIP+4 data is rigorously linked to every US street segment.
  • Segments are scored based on match rates.
  • Areas are incorporated cleanly without jagged fence-posting.


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