Ilwaco ( il-WAH-koh) is a city in Pacific County, Washington, United States. The population was 936 at the 2010 census. Founded in 1890, the city was home to the Ilwaco Railway and Navigation Company along the Long Beach Peninsula, with its core economy based on logging and timber rafting. The city is located on the southern edge of the Long Beach Peninsula, on Baker Bay on the north side of the Columbia River where it meets the Pacific Ocean. It is near the city of Astoria, Oregon, which lies to the southeast on the southern bank of the Columbia.
Ilwaco was first settled by Henry Feister in 1851, and was named for Elwahko Jim, the son in law of Chief Comcomly. Ilwaco was officially incorporated on December 16, 1890. A narrow gauge railway, Ilwaco Railway and Navigation Company, ran for over thirty years. Similarly to the nearby city of Astoria, Oregon, and the surrounding communities, Ilwaco historically had a significant population of Finnish immigrants.
The railroad ran north up First Street in Ilwaco. A published photo shows the railroad's Ilwaco facilities, including a gallows turntable and elevated watering trough, were located on the southwest corner of the intersection of First and Spruce streets.