a clustering of census blocks

a statistical summary area that may closely relate to neighborhoods of cities and towns, created by the Census Bureau as an effort to assist the states in the redistricting process

A block group is a subdivision of a census tract in a Census Geocode (or, prior to 2000, a block numbering area). A block group is the smallest geographic unit for which the Census Bureau tabulates sample data. A block group consists of all the blocks within a census tract with the same beginning number. Example: block group 3 consists of all blocks within a 2000 census tract numbering from 3000 to 3999. In 1990, block group 3 consisted of all blocks numbered from 301 to 399Z. Block groups are non-overlapping.( Back to the top)

A combination of Census blocks that is a subdivision of a census tract.  The block group is the smallest unit for which the Census Bureau reports a full range of demographic statistics.  Applications include: Profiling, Trade Area Analysis, Site Selection and Custom Mapping

A census block group is a geographical unit used by the United States Census Bureau which is between the census tract and the census block. It is the smallest geographical unit for which the bureau publishes sample data, i.e data which is only collected from a fraction of all households.