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A century of population change

This interactive map from the U.S. Census Bureau shows the state-by-state change over a century in population, density and Congressional representation.

KEY

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.