Census Block Groups 2010

Block groups are geographic subdivisions of census tracts; their primary purpose is to provide a geographic summary unit for census block data. A block group must comprise a reasonably compact and contiguous cluster of census blocks. Each census tract contains a minimum of one block group and may have a maximum of nine block groups.

人口普查街区组（block group）是人口普查片区（census tract）的地理细分单元，其主要功能是为人口普查街区（census block）数据提供标准化的地理汇总载体。单个街区组必须由一组相对紧凑且彼此毗邻的人口普查街区构成。每个人口普查片区至少包含一个街区组，最多可容纳九个街区组。