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 Glossary ACG See Address Coding Guide.

Active governmental unit A governmental unit that has elected or appointed officials, raises revenues, and performs governmental activities (such as enactment of laws, provision of services, and entering into contracts). See also functional status (governmental), functioning governmental unit, inactive governmental unit, nonfunctioning governmental unit.

Address The number or other designation assigned to a housing unit, business establishment, or other structure for purposes of mail delivery, emergency services, and so forth. See also city-style address, general delivery address, post office box address, rural address.

Address coding guide (ACG) A computerized inventory of street names, address ranges, and census block numbers, created by the Census Bureau in cooperation with local agencies, to permit the automated assignment of addresses on a mailing list to the geographic entity codes for the 145 largest urban cores of metropolitan areas (MAs) at the time of the 1970 census. Each file contained the name of each block side that was a street or road, its associated address range and ZIP Code, and 1970 census geographic entity information for that side of the street. It was the forerunner of the GBF/DIME-Files and the TIGER data base. See also GBF/DIME-File, TIGER data base.

Address Reference File (ARF) A series of computerized files containing street and building records used to geocode the economic censuses. The files show, by ZIP Code, the low and high addresses associated with each street name within incorporated places of 2,500 or more population, special economic urban areas (SEUAs) of 10,000 or more population, balances of counties, and balances of (S)MSAs. GlossaryG-1