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.

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.

Historical Apportionment Data Map

This interactive map widget shows 10 decades of apportionment history, current apportionment totals and our changing population through the past century.

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.

The U.S. Census and the Amazing Apportionment Machine

Through animation, the U.S. Census Bureau explains how it uses the apportionment formula to ensure equal representation for all.