Dayton is a city in and the county seat of Columbia County, Washington, United States. The population was 2,448 at the 2020 census. Dayto…Dayton is a city in and the county seat of Columbia County, Washington, United States. The population was 2,448 at the 2020 census. Dayton was founded in the 1860s. A town site plat was filed by Jesse N. and Elizabeth Day on November 23, 1871. The city was officially incorporated on November 10, 1881, and was named for Jesse Day. Dayton has the oldest train depot in Washington state, dating from 1881, and the oldest continuously used courthouse, operating since 1887. The historic community of Baileysburg was situated about one mile southeast of Dayton, at the junction of North Touchet and South Touchet Roads.
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