1 definition found washougal - U.S. Gazetteer (1990) : Washougal, WA (city, FIPS 76405) Location: 45.57903 N, 122.34394 W Population (1990): 4764 (2010 housing units) Area: 6.7 sq km (land), 0.1 sq km (water) Zip code(s): 98671