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Barrio Along with Barrio-Pueblo, the primary legal subdivision of municipios in Puerto Rico. Similar to the minor civil divisions (MCDs) used for reporting census data in 28 states of the United States. Related term: Municipio, Subbarrio Barrio-Pueblo Along with Barrio, the primary legal subdivision of municipios in Puerto Rico. Similar to the minor civil divisions (MCDs) used for reporting census data in 28 states of the United States. Related term: Municipio, Subbarrio Base map Map content including geographic, physical, cultural, political, and statistical features for locational reference. Basic Facts A pre-defined presentation of the most frequently requested data in American FactFinder from the decennial and economic censuses relative to a particular geographic area. Block A subdivision of a census tract (or, prior to 2000, a block numbering area), a block is the smallest geographic unit for which the Census Bureau tabulates 100-percent data. Many blocks correspond to individual city blocks bounded by streets, but blocks – especially in rural areas – may include many square miles and may have some boundaries that are not streets. The Census Bureau established blocks covering the entire nation for the first time in 1990. Previous censuses back to 1940 had blocks established only for part of the nation. Over 8 million blocks are identified for Census 2000. Related terms: 100-percent data, Census block, Census geography, Census tract, Block group (BG) A subdivision of a census tract (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. Related terms: Census block, Census geography, Census tract, Sample data Block numbering area (BNA) Prior to Census 2000, a statistical subdivision created for grouping and numbering blocks within a county for which census tracts had not been established. Beginning with Census 2000, all counties have census tracts, making block numbering areas unnecessary. Related term: Census tract Borough A county equivalent in Alaska, a minor civil division in New York, and an incorporated place in Connecticut, New Jersey, and Pennsylvania. Related term: County and equivalent entity Boundary The extent or limit of a geographic area such as a block, census tract, county, or place. A boundary may or may not follow a visible geographic physical feature. Bureau of Indian Affairs The federal government agency, located in the Department of the Interior, responsible for the historic and legal relationships between the federal government and American Indian communities.