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Confirm what Iowa has on file first, then use Jefferson County's official election channels below.

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About Jefferson County

Jefferson County is a county located in the U.S. state of Iowa. As of the 2020 United States census, the population was 15,663. The county seat is Fairfield. The county was formed in January 1839, and was named for U.S. President Thomas Jefferson. Jefferson County comprises the Fairfield, IA Micropolitan Statistical Area.

Description adapted from Wikipedia, CC BY-SA 4.0.

Jefferson County, Iowa
Jefferson County, Iowa Courthouse — CC BY-SA 3.0, en:User:Cburnett · source

Jefferson County at a glance

County seat
Fairfield
Population
15,663 (2020)
Land area
437 sq mi
Founded
1839

Largest communities in Jefferson County

  1. Fairfield county seat 9,416
  2. Center Township 1,181
  3. Locust Grove Township 716
  4. Liberty Township 679
  5. Lockridge Township 627

Start here

Confirm you're ready to vote in Jefferson County

  1. Run a guided check

    Scan Check Protect walks you through verifying your Iowa registration and flags anything that needs fixing — free.

    Start at Scan Check Protect →

  2. Ask Jefferson County directly

    Your county election office handles registration, mail ballots, and polling places.

    Jefferson County election office →

Official channels

Jefferson County election resources

Statewide tools and every Iowa resource in one place: the Iowa page at Scan Check Protect →

Neighboring counties

Part of Iowa Voter Check

This is the Jefferson County page of Iowa Voter Check, a project of True the Vote, pointing Iowa voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Jefferson County or the Iowa Secretary of State publishes, they are right and this page is not.