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 the 1980 decennial census. See also Historic Areas of Oklahoma, tribal designated statistical area.

Tribal trust land See American Indian trust land.

UA See urbanized area.

UA code A four-digit numeric code assigned by the Census Bureau to identify UAs. See also Federal Information Processing Standards, Geographic Identification Code Scheme.

Undevelopable territory (urbanized area) Includes water areas, mud flats, swamps, marshlands, steep slopes, and other terrain on which residential or commercial development is virtually impossible because of physical limitations. Local zoning classifications of land do not necessarily correspond to the Census Bureau’s definition of undevelopable land for the purpose of defining UAs. Territory that is undeveloped is not necessarily undevelopable. See also jump, jump corridor, urbanized area.

U.S. See United States.

Unified district A school district inclusive of kindergarten through twelfth grade. See also school district.

Unincorporated place See census designated place.

United States The 50 States and the District of Columbia.

United States Geological Survey (USGS) A bureau of the U.S. Department of the Interior, the USGS is the Nation’s main topographic mapping agency.

United States Postal Service (USPS) An independent corporation of the U.S. Government, the USPS provides mail processing and delivery services to individuals and businesses in the United States, Puerto Rico, and the Outlying Areas. G-52Glossary