Federal Information Processing Standards (FIPS) 55, [1984]

Each geographic entity listed in this collection is identified by a unique two-character state code and a five-character numeric place code. Areas of the United States covered are the 50 states, the District of Columbia, and all outlying territories with significant self-administration (American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, Trust Territory of the Pacific Islands, and the Virgin Islands). An exhaustive list is included of incorporated places, census designated places (CDPs), primary county divisions, recognized Indian reservations, and Alaska Native villages and counties. The listing also includes unincorporated places, military bases, national parks, airports, and ground transportation points. The two-character class code distinguishes over 70 entity types. Each entity is identified by the county or counties in which it is located. All categories and military bases are identified by congressional district and, in most cases, by standard metropolitan statistical areas (SMSAs). Incorporated places, CDPs, and Indian and Alaska Native areas are cross-referenced to United States Bureau of the Census files. In addition, ZIP codes are provided for all post offices.