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Read briefs and reports from Census Bureau experts.
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Read research analyses from Census Bureau experts.
Developer portal to access services and documentation for the Census Bureau's APIs.
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These external sites provide more data.
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How we provide the best mix of timeliness, relevancy, quality, and cost for the data we collect.
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Explore the rich historical background of an organization with roots almost as old as the nation.
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The Census Bureau's Director writes on how we measure America's people, places and economy.
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Find media toolkits, advisories, and all the latest Census news.
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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.