Pomeroy is the county seat of Garfield County, Washington, United States and the only incorporated city in the county. The population was 1,389 at the 2020 census, and was estimated at 1,471 in 2024. and platted the town's site in May 1878.
Pomeroy was officially incorporated on February 3, 1886. The town has been the seat of Garfield County since 1882, despite fierce competition in the 1880s with neighboring towns Pataha and Asotin. The county was split in October 1883, and the city of Asotin was named the county seat of the new Asotin County, Washington, leaving the debate about Pomeroy's status as county seat for Garfield County to continue. The debate continued through both houses of the Washington Territorial Legislature in for the remainder of 1883 to Governor William A. Newell of the Washington Territory, and eventually reached the United States Congress in 1884. In 1912, the city voted to outlaw the manufacture or sale of alcohol. The prohibition quickly led to rampant bootlegging and corruption which lasted until the 21st Amendment passed in 1933.
thumb|The Catholic Church in Pomeroy, Washington, United States.
On August 21, 2003, following efforts by the Pomeroy Historic Committee, a 10-block section of the Downtown Pomeroy Historic District was placed on the National Historic Register.
Geography
According to the United States Census Bureau, the city has a total area of , all land.
|source 2 = National Weather Service