The 2010 Census block relationship files are provided as tools to help data users compare the universe of Census 2000 blocks to the universe of 2010 Census blocks. From these files, data users may determine how Census 2000 blocks now relate to 2010 Census blocks and vice versa.
The following block relationship files are available:
The data contained in block relationship files are extracted from the Census Bureau's internal Master Address File/Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) database.
The 2010 Census Block Relationship Files are available for the 50 states, the District of Columbia, Puerto Rico, American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands.
Note: Tabulation blocks are the blocks used to tabulate and present decennial census data. The 2010 Census collection blocks are the blocks used in operations supporting decennial census data collection.