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See article: Using Internet Archive to Find Historical Documents and Downloadable Data Files for more information about how to use Internet Archive.