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A common misunderstanding is that data users think census blocks are used geographically to build all other census geographic areas, rather all other census geographic areas are updated and then used as the primary constraints, along with roads and water features, to delineate the tabulation blocks. As a result, all Census blocks nest within every other Census geographic area, so that Census Bureau statistical data can be tabulated at the block level and aggregated up to the appropriate geographic areas.
Virgin Islands. Blocks are the smallest geographic areas for which the Census Bureau publishes data from the decennial census. Each census tract contains at least one block group and are uniquely numbered within census tracts. Census block groups generally have a population size between and 3, people, with optimum size of 1, people.
Skip to main content. Office of Financial Management. State budgets enacted budgets Governor's proposed budgets Governor's proposed supplemental budget Governor's proposed supplemental budget —21 enacted budgets Governor's proposed budgets. Building a modern work environment. They include counties in 48 states; parishes in Louisiana; boroughs and census areas in Alaska; municipios in Puerto Rico; independent cities in Maryland, Missouri, Nevada, and Virginia; and other e ntities in the Island Areas.
In 21 states where MCDs do not exist or are not adequate for reporting subcounty statistics, the Census Bureau, in cooperation with state and local officials, delineates county su bdivisions known as Census County Divisions. Places are concentrations of population such as cities, that have legally prescribed boundaries, powers, and functions. Other population centers without legally defined corporate limits or corporate powers are defined by the Census Bureau in cooperation with state officials and local data users.
Census tracts generally contain between 1, and 8, people with an optimum size of 4, people. Census tract boundaries are delineated with the intention of being stable over many decades, so they generally follow relatively permanent visible features. However, they may follow governmental unit boundaries and other invisible features in some instances; the boundary of a state or county is always a census tract boundary.
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