"The U.S. Census Bureau offers thousands of statistics at hundreds of geographic levels. Census Bureau geographies help us organize all of this information. One of the most popular levels of geography used in statistical analysis is the census tract, which is used in community planning, grant writing, real estate, research and much more.
Census tracts are subdivisions of counties, with approximately 4,000 people per tract. They are relatively stable over time, allowing for comparisons of data over time. The Census Bureau offers two types of census tracts: the standard state-county census tracts and tribal census tracts. You may even live in an area covered by both types of census tracts if you live on a federally-recognized American Indian reservation or off-reservation trust land.
State-county census tracts are small statistical subdivisions of a county or county equivalent. They cover the entire U.S. and provide a stable set of geographic units for presenting statistical data. Because they are defined by population—ideally about 4,000 people—they can vary greatly in land area. A standard census tract must be entirely within one county and cannot cross into another county. Census tracts do not have to follow other boundaries, such as places or county subdivisions.
Tribal census tracts are small statistical subdivisions of a reservation and off-reservation trust land. Their primary purpose is the same as census tracts: the presentation of statistical data. However, rather than nesting within a county, tribal census tracts nest within a single federally recognized American Indian area, providing coverage across all federally recognized American Indian reservations and off-reservation trust lands. Tribal census tracts have population criteria identical to county-based census tracts..."
Tuesday, July 17, 2012
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