Ilwaco is a city in Pacific County, Washington, United States. The population was 1,087 at the 2020 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.

Pacific County is a county in the U.S. state of Washington. As of the 2020 census, the population was 23,365. Its county seat is South Bend, and its largest city is Raymond. The county was formed by the government of Oregon Territory in February 1851 and is named for the Pacific Ocean.