Medicare Zip Code to Carrier Locality File


Researchers and data users who are working with CMS files may need to map zip code information to CMS carriers and localities. This article describes where to find current and historical versions of the file.

Current Version Date:

CMS produces a "Zip Code to Carrier Locality File" that is available for download from the CMS Fee Schedules – General Information website. For each zip code, the file will include carrier numbers, locality numbers, and state codes. The file will also include an indicator for urban, rural or a low density (qualified) area. The CMS website only maintains the most recent version of the file.

Historical versions of the file may be found on To search for a specific year:

See article: Using Internet Archive to Find Historical Documents and Downloadable Data Files for more information about how to use Internet Archive.