This is the CodeSystem that contains codes in both Federal Information Processing Standards Publication: Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas (FIPS 6-4) (http://terminology.hl7.org/CodeSystem/FIPS64) and Federal Information Processing Standards Publication: Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas (FIPS 6-4) (http://terminology.hl7.org/CodeSystem/FIPS64).