Columbia County, Washington
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Question 1 of 7
What should I know about this county?
About Columbia County
Columbia County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 3,952, making it the second-least populous county in Washington. The county seat and largest city is Dayton. The county was created out of Walla Walla County on November 11, 1875, and is named after the Columbia River. Columbia County is included in the Walla Walla, WA Metropolitan Statistical Area.
Description adapted from Wikipedia, CC BY-SA 4.0.
Question 2 of 7
What is this county like?
Columbia County at a glance
- County seat
- Dayton
- Population
- 3,952 (2020)
- Land area
- 873 sq mi
- Founded
- 1875
Question 3 of 7
Where do people live here?
Largest communities in Columbia County
- Dayton county seat2,448
- Starbuck119
Question 4 of 7
Am I registered here?
Start here
Confirm you're ready to vote in Columbia County
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Step 1
Run a guided check
Scan Check Protect walks you through verifying your Washington registration and flags anything that needs fixing — free.
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Step 2
Ask Columbia County directly
Your county election office handles registration, mail ballots, and polling places.
Question 5 of 7
Who runs elections in this county?
Official channels
Columbia County election resources
Statewide tools and every Washington resource in one place: the Washington page at Scan Check Protect →
Question 6 of 7
Who are this county's neighbors?
Neighboring counties
Question 7 of 7
Who made this site?
Part of Washington Voter Check
This is the Columbia County page of Washington Voter Check, a project of True the Vote, pointing Washington voters at the official tools that already exist — and at Scan Check Protect to verify your registration.
Where anything here differs from what Columbia County or the Washington Secretary of State publishes, they are right and this page is not.