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 ANCSA See Alaska Native Claims Settlement Act.

Annex To add territory to a governmental unit, usually an incorporated place, by an ordinance, a court order, or other legal action. See also detach.

Annexation The act or process of adding land to a governmental unit, usually an incorporated place, by an ordinance, a court order, or other legal action.

ANRC See Alaska Native Regional Corporation.

ANV See Alaska Native village.

ANVSA See Alaska Native village statistical area.

ARA See address register area.

Area measurement The determination of the extent of surface area, expressed in square miles and/or square kilometers, of land and/or water within a predetermined boundary. Formerly accomplished by measuring on a correctly scaled map, area measurements for the 1990 census were calculated by computer based on the locations of features and boundaries in the TIGER data base.

Assessment district A nonfunctioning MCD defined only to administer tax assessments for a county. For the 1990 census, the Census Bureau recognized assessment districts as MCDs only in Anne Arundel County, Maryland.

AU See analysis unit.

Barrio A nonfunctioning legal subdivision of a municipio in Puerto Rico, treated as an MCD by the Census Bureau. A barrio (or group of barrios) is the area from which municipio officials and the Commonwealth legislature are elected. See also barrio-pueblo, ciudad, county subdivision, nonfunctioning government. GlossaryG-5