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.