http://terminology.hl7.org/CodeSystem/FIPS64|1.0.0

Federal Information Processing Standards Publication: Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas (FIPS 6-4)

\"The FIPS county code is a five-digit Federal Information Processing Standard (FIPS) code (FIPS 6-4) which uniquely identifies counties and county equivalents in the United States, certain U.S. possessions, and certain freely associated states. This is the 3-digit part of the 5-digit county FIPS code specifically standing for the county.\"\r\n\r\nFor more information, see [https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub6-4.pdf](https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub6-4.pdf)