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 Designed to be relatively homogeneous units with respect to population characteristics, economic status, and living conditions at the time the CSAC established them, census tracts usually contain between 2,500 and 8,000 inhabitants. They may be split by any subcounty geographic entity. See also block numbering area, census statistical areas committee, census tract number, central business district.

Census tract committee See census statistical areas committee.

Census tract key person (CTKP) See census statistical areas key person.

Census Tract Manual A Census Bureau publication that described the steps a local census tract committee had to follow when it developed a census tract plan. The first edition was published in 1934; the last, in 1966. See also census statistical areas committee, Geographic Areas Reference Manual.

Census tract number A four-digit number, possibly with a two-digit suffix, used to identify a census tract. Census tract numbers are always unique within a county and usually unique within an MA. Almost all census tract numbers range from 0001 to 9499. Leading zeros are not shown on the Census Bureau’s maps or in its printed reports.

Census Tract/Block Numbering Area Outline Map A map (or set of maps) depicting the boundaries and numbers of census tracts/BNAs in a county or equivalent entity. The map also displays features and feature names underlying the boundaries, and the boundaries and names of counties, AIANAs, county subdivisions, and places (but not the street pattern within census tracts/BNAs). Each map sheet is approximately three feet by four feet in size.

Central business district (CBD) The commercial center of an MA central city or other MA city with a population of 50,000 or more, recognized for tabulating statistical data in the 1948 through 1982 economic censuses, and in the 1950 to 1980 decennial censuses. A CBD was defined as an area of very high land valuation and high traffic flow, characterized by a high concentration of GlossaryG-11