Explore the Research section for rich resources to enhance classroom learning. Here you will find historical documents such as maps, census questionnaires and results, and photographs categorized by historical era. To supplement learning about math and statistics find modern maps, data visualizations, briefs on relevant findings, videos and more.
Apportionment is the most important function of the decennial census. Apportionment measures the population so that seats in the U.S. House of Representatives can be correctly apportioned among the states. This map shows the apportionment of the U.S. House of Representatives based on the 2010 Census.