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2010 Census: Apportionment Data Map

The Census Bureau's interactive map widget enables users to view 10 decades of apportionment history, current apportionment totals and our country's changing population through the past century.

View as HTML: Population Change, Population Density, Apportionment

Download as CSV: Population Change, Population Density, Apportionment

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Data provided by U.S. Census Bureau.

Population Density: Includes Puerto Rico and the District of Columbia in population density rankings, 1 to 52.

Apportionment: Apportionment is the process of dividing the 435 seats in the House of Representatives among the 50 states. Puerto Rico and the District of Columbia are not included.

Alaska and Hawaii gained statehood in 1959. Arizona and New Mexico gained statehood in 1912. For apportionment, data before those periods are not reflected on the map.

Congress did not reapportion in 1920. Therefore, the apportionment data shown for this decade replicates the data for 1910. There is no data reflected for the apportionment population in the 1920 "people per representative" chart.

Related Information

2010 Census