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Census block group
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<p>A Census Block Group is a geographical unit used by the <a href="/facts/United_States_Census_Bureau/heKtzoXX">United States Census Bureau</a> which is between the <a href="/facts/Census_tract/YfuVwtRE">Census Tract</a> and the <a href="/facts/Census_block/HNBolNkz">Census Block</a>. 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. Typically, Block Groups have a population of 600 to 3,000 people. </p><p>Every Census Block Group has a unique 12-digit <a href="/facts/FIPS_code/n0Ll7hpQ">FIPS code</a>. The Block Group's unique identifier is the 12th digit of the FIPS Code. This number determines the first digit of all the census blocks contained within a block group. For instance, census Block Group 2 includes any block numbered 2000 to 2999. </p><p>For the 2000 US Census, the <a href="/facts/United_States/P0sCdLe5">United States</a> including <a href="/facts/Puerto_Rico/jVStMyG4">Puerto Rico</a> had 211,267 block groups, each containing an average of 39 blocks. </p><p>For the 2010 US Census, the <a href="/facts/United_States/P0sCdLe5">United States</a> (not including <a href="/facts/Puerto_Rico/jVStMyG4">Puerto Rico</a>, <a href="/facts/United_States_Virgin_Islands/VwDBzBGT">United States Virgin Islands</a>, etc.) had 217,740 block groups, each containing an average of 51 blocks. </p> <ul><li>Definition is from the United States Census Bureau Glossary. "Block Group (BG)" definition on the <a href="https://www.census.gov/programs-surveys/geography/about/glossary.html#par_textimage_4">Letter_B_page</a></li> <li>Statistics from the Census Bureau's <a href="https://www.census.gov/geo/landview/lv6help/pop_estimate.html">description</a> of the Landview 6 software.</li></ul>