2000 U.S. Census Data Aggregated by Census Block Group

This dataset consists of polygonal boundaries for the 2000 Census Block Groups with 2000 Block Group level data. A census block group (BG) is a cluster of blocks that have the same first digit in their identifying number within a census tract. For example, Block Group 2 (BG 2) within a census tract includes all blocks numbered from 2000 to 2999. Block groups generally contain between 600 and 3,000 people, with an optimum population size of 1,500. Block Groups never cross census tract or BNA boundaries, but may cross the boundaries of county subdivisions, places, American Indian and Alaska Native areas, urbanized areas, voting districts, and congressional districts.