What it actually is

Redistricting is the process of drawing the maps that decide which neighborhoods and counties are grouped into a voting district. Those maps determine who votes together for seats in the U.S. House, state legislatures, and often local bodies.

Most redistricting happens after the decennial census, when states get updated population counts. The goal is to keep districts roughly equal in population so each person’s vote has similar weight. Federal law, including the Voting Rights Act, also limits drawing districts in ways that discriminate against voters based on race.

How it works

First, the decennial census provides new population numbers. Those counts can change how many U.S. House seats each state gets (that step is called reapportionment). After reapportionment, states redraw the actual district lines inside the state.

Who draws the lines depends on state law. In many states the state legislature draws the maps; in others an independent or bipartisan commission does. Common principles used in many states include equal population, geographic contiguity, and protecting the voting power of minority communities under federal civil-rights laws.

Maps can be challenged in state or federal court if someone believes the lines break the law. Courts can order maps changed. The details—how strict the rules are and which body draws maps—vary widely from state to state.

A real example

After a census, many states have high-profile fights over new maps. In some states voters or legislatures created independent redistricting commissions to reduce political influence; other states leave the job to their legislatures. Courts in multiple states have at times rejected maps and required redraws when judges found unlawful discrimination or violations of state rules.

Why it matters to you

District lines determine which candidates you can vote for and who represents your neighborhood at state and federal levels. That affects what issues get attention, how resources are allocated, and how easy or hard it is for challengers to win.

Even small changes in a boundary can change which community voices are grouped together, so redistricting can shape local policy and political power for a decade.

Common misunderstandings

Redistricting is not the same as reapportionment: reapportionment is the distribution of House seats among states after the census; redistricting is how each state draws its internal district lines. They are related steps but different processes.

Also, not all redistricting is gerrymandering. Gerrymandering is the intentional drawing of lines to give an unfair advantage to a party or group. Redistricting describes the process of drawing districts; whether a particular map is partisan or unlawful is a separate question often decided in courts or by state rules.