1 definition found laytonsville - U.S. Gazetteer (1990) : Laytonsville, MD (town, FIPS 46250) Location: 39.20963 N, 77.14156 W Population (1990): 248 (98 housing units) Area: 2.5 sq km (land), 0.0 sq km (water) Zip code(s): 20879, 20882