The Constitutional basis for conducting the decennial census is to reapportion the U.S. House of Representatives. Apportionment is the process of dividing the 435 memberships, or seats, in the U.S. House of Representatives among the 50 states.
Publications
Congressional Apportionment: 2010 Census Brief
Trends in congressional apportionment and the apportionment population—what it is, who is included, and what method is used to calculate it.
What You Should Know About the Apportionment Counts: 2000
This brochure discusses apportionment, including who is included in apportionment counts, when counts are released, and how apportionment is calculated.
Data
Historical Apportionment Data (1910-2010)
Historical apportionment data for the nation and states.
2010 Census Apportionment Results
Congressional seats were apportioned among the 50 states based on the 2010 Census population counts. Apportionment results from 1790 to 2010 are also shown.
2000 Census Apportionment Results
Congressional seats were apportioned among the 50 states based on the 2000 Census population counts. Apportionment results from 1790 to 2000 are also shown.
Videos
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