What Is Redistricting?
Every ten years, following the national census, electoral district boundaries are redrawn to reflect population changes. This process — known as redistricting — determines how communities are grouped into congressional, state legislative, and local voting districts. It sounds administrative. In practice, it's one of the most consequential political acts in a democracy.
Because district maps shape which voters are grouped together, they directly influence which party or candidate is likely to win each seat. Getting redistricting right is essential to fair representation. Getting it wrong — or manipulating it deliberately — can distort election outcomes for a decade.
Who Draws the Maps?
The answer varies widely depending on where you live. Common approaches include:
- State legislatures: In many states, the party controlling the legislature draws district maps. This creates an obvious conflict of interest — incumbents effectively choosing their own voters.
- Independent redistricting commissions: Several states have moved to commissions made up of citizens or nonpartisan officials to reduce political influence over the process.
- Bipartisan commissions: Some states use commissions that require agreement between representatives of both major parties.
- Courts: When legislatures deadlock or maps are challenged, courts sometimes step in to draw or approve final boundaries.
Understanding Gerrymandering
Gerrymandering refers to the manipulation of district boundaries to favor one party, group, or incumbent. The term dates back to 1812, when Massachusetts Governor Elbridge Gerry approved a salamander-shaped district designed to benefit his party.
Two common techniques are used:
- Packing: Concentrating opposition voters into a small number of districts so they win those seats by huge margins — wasting votes — while the dominant party wins more seats overall.
- Cracking: Splitting opposition voter communities across multiple districts so they don't form a majority in any of them.
Both techniques are used by parties across the political spectrum when they control the map-drawing process.
Legal Guardrails
Redistricting isn't a free-for-all. Maps must comply with several legal requirements:
- Equal population: Districts must contain roughly equal numbers of residents ("one person, one vote").
- Voting Rights Act compliance: Maps cannot be drawn to dilute the voting power of racial or language minorities.
- Contiguity: Districts must generally be made up of connected territory.
Partisan gerrymandering, however, is harder to challenge in federal court. A 2019 Supreme Court ruling held that federal courts cannot strike down maps purely on partisan grounds, leaving that avenue largely to state courts and commissions.
Why It Matters to You
Redistricting determines whether your community's political preferences are amplified or diluted in government. It shapes which issues get attention, which districts are considered "competitive," and whether incumbents can safely ignore entire groups of voters. Understanding the process — and engaging with public hearings when new maps are drawn — is one of the most direct ways citizens can influence their long-term political representation.
The next round of redistricting will follow the 2030 census. But legal battles from the most recent cycle are still working through the courts — meaning the maps governing today's elections are still, in many places, contested ground.