Ridgefield is a city in northern Clark County, Washington, in the United States. The population was 4,763 at the 2010 census. Located within the Portland metropolitan area, Ridgefield is notable for the significant Native American history and connection to the Lewis and Clark Expedition. It is also the headquarters of the Ridgefield National Wildlife Refuge, a primary reserve for migrating waterfowl on the Pacific Flyway, and the home of the Ridgefield High School “Spudders” (reflecting the area’s potato-farming heritage). Wiki