You can now view the results of every apportionment since 1910 in this new interactive map from the U.S. Census Bureau. The map displays the change in the number of U.S. House seats for each state in each decade, the percent change in population, and population density for each state.
U.S. Census Bureau March 22, 2021: Interactive Apportionment Map Now Available
The U.S. Census Bureau launched a new online map today ahead of the 2020 Census apportionment results release. The “Historical Apportionment Data Map” currently displays apportionment results for each census from 1910 to 2010. 2020 Census apportionment results will be added to the map as they become available.
The interactive map includes the following types of data for each census from 1910 to 2010:
• Number of seats in the U.S. House of Representatives
• Changes to each state’s number of seats in the U.S. House of Representatives
• Population per representative for each state
• Resident population of each state
• Percentage change in resident population for each state
• Population density of each state
For more on apportionment, read the Bureau’s factsheet
You can view the interactive map on our Data & Technology Page
