If you want to find out what county is Naselle, Washington, you've come to the right place. Naselle is located in the Willapa Hills and flows through the valley into the bottomlands, eventually emptying into Willapa Bay. A small village sits along the river and has a Finnish heritage. The town got its name from the Nasil tribe, who lived in the area long before European settlers arrived. The Nasil people were wiped out by smallpox in the early 1800s, but six families survived and made their homes near the modern village.