What is a census block group?

Juan Vasquez -

Block groups consists of clusters of blocks, and are statistical divisions of census tracts. BGs generally contain between 600 and 3,000 people. Each block group is uniquely numbered within a census tract (each census tract contains at least one block group), and never cross state, county or census tract boundaries.

Below is an image of a census block group:


Block groups also contain a code range, of a single digit between 0-9. These single digits represent all blocks within the range, such that BG 4 contains all blocks 4000-4999. See the picture below for an explanation of a location in the United States:


United States Census Bureau, Geographic Terms and Concepts – Block Groups

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