Glossary on the Republic
Apportionment
VotingIt is how the 435 seats in the House get divided among the states, and it happens every ten years after the census. The math is dry. The power it shifts is anything but.
Apportionment is the process of distributing the seats in the House of Representatives among the states according to their populations. After each census, the fixed number of 435 House seats is reallocated so that states gaining population gain seats, and those losing population lose them.
It is required by the Constitution. Article I directs that representatives be apportioned among the states by population, counted every ten years. This is the original reason the census exists: to fairly divide political representation.
It carries enormous stakes. A seat gained or lost changes a state's voice in the House and, because electoral votes are tied to congressional seats, its weight in choosing the president. The count quietly reshuffles national power every decade.
It is distinct from, but linked to, redistricting and gerrymandering. Apportionment decides how many seats each state gets; redistricting then draws the lines for those seats within the state, where the gerrymander does its work.
The distribution of House seats among states by population after each census; required by Article I.
Apportionment is the hinge between counting people and dividing power. Every ten years, the census numbers flow into this formula, and seats shift between states, changing the balance of the House and the path to the presidency. It is the quiet arithmetic of representation, the reason the founders insisted on counting the people in the first place.
Quorum Reading Room. Sourced from public reference and historical record; see notes.