Naselle is a census-designated place (CDP) in Pacific County, Washington, United States. The population was 419 at the 2010 census. Though very near Columbia River's estuary, the valley's Naselle River flows west into nearby Willapa Bay and then into the Pacific Ocean. Close about the town lie the evergreen-covered Willapa Hills. The river's name has been spelled Nasel and Nasal. An early settler along the river called it the Kenebec. The name comes from the Nisal Indians, a Chinookan tribe formerly residing on the river.
As of the census of 2000, there were 377 people, 160 households, and 110 families residing in the CDP. The population density was 164.6 people per square mile (63.6/km²). There were 184 housing units at an average density of 80.3/sq mi (31.0/km²). The racial makeup of the CDP was 92.57% White, 0.27% African American, 2.12% Native American, 0.53% Asian, and 4.51% from two or more races. Hispanic or Latino of any race were 0.53% of the population. 33.2% were of Finnish, 10.0% German, 7.9% Irish and 7.5% American ancestry according to Census 2000.
There were 160 households out of which 31.3% had children under the age of 18 living with them, 59.4% were married couples living together, 6.3% had a female householder with no husband present, and 31.3% were non-families. 25.0% of all households were made up of individuals and 17.5% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.85.