Block Group

Block Group or Subblock - A small geographical area within a census tract, defined by the U.S. Census, consisting of a few hundred households.

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Source: Postcom, 11 February 2010 14:05:34, http://postcom.org/public/admail_image/glossary.htm

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block group - [federal government] A unit of U.S. census geography that is a combination of census blocks. A block group is the smallest unit for which the U.S. Census Bureau reports a full range of demographic statistics. There are about 700 residents per block group. A block group is a subdivision of a census tract.

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Source: esri, 01 February 2012 16:05:03, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation