Dayton is a city in and the county seat of Columbia County, Washington, United States. The population was 2,448 at the 2020 census.
Sammamish considered naming the park “Bigger Rock Park” to distinguish it from the identically named park in Duvall.
The city [Dayton, Washington] was officially incorporated on November 10, 1881, and was named for Jesse Day.
A town site plat [for Dayton, Washington] was filed by Jesse N. and Elizabeth Day on November 23, 1871.