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2000 Block Groups
Most Block Groups were delineated by local participants as part of the U.S. Census Bureau's Participant Statistical Areas program. The U.S. Census Bureau delineated Block Groups only where a local, state, or tribal government declined to participate or where the U.S. Census Bureau could not identify a potential local or tribal participant.
Block Groups never cross the boundaries of states, counties, or statistically equivalent entities, except for a BG delineated by American Indian tribal authorities, and then only when tabulated within the American Indian hierarchy. Block Groups never cross the boundaries of census tracts, but may cross the boundary of other geographic entity required as a census block boundary.
In decennial census data tabulations, a BG may be split to present data for every unique combination of American Indian area, Alaska Native area, Hawaiian home land, congressional district, county subdivision, place, voting district, or other tabulation entity shown in the data products. Block Groups are used in tabulating data nationwide, as was done for the 1990 census, for all block-numbered areas in the 1980 census and for selected areas of the 1970 census. For data presentation purposes, Block Groups are a substitute for the enumeration districts used for reporting data in many parts of the United States for the 1970 and 1980 censuses and in all areas before 1970. Also, Block Groups are the lowest level of the geographic hierarchy for which the U.S. Census Bureau tabulates and presents sample data.
Geographic Coverage
-50 States; D.C.
Scale
-1:100,000
Minimal Requirements
-Minimum of 408MB of hard disk space
Vintage Date
-April 2001
Source
-Bureau of the Census
Unit of Sale
-U.S.; State
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