A census tract
, census area
, or census district
is a particular community
defined for the purpose of taking a census
. Usually these coincide with the limits
or other administrative areas and several tracts commonly exist within a county. In unincorporated areas
of the United States these are often arbitrary, except for coinciding with political
In the United States, census tracts are subdivided into block groups and census blocks.
Unlike any other U.S. state
is not entirely divided into county equivalents. Most of Alaska's area is not contained within one of the state's 16 boroughs
. This area, referred to by the Alaskan government
as the Unorganized Borough,
has been divided into census areas by the United States Census Bureau
. These census areas have no government of their own; they exist solely to facilitate Census Bureau operations.
See also: county