Dayton, Washington
Overview
Dayton is a city in and the county seat
County seat
A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 of Columbia County, Washington, United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The population was 2,526 at the 2010 census.
Dayton was founded in the 1860s. A town site plat was filed by Jesse N. and Elizabeth Day on November 23, 1871. The town was officially incorporated by Jesse Day on November 10, 1881. The name is in honor of Mr.
 
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