1 definition found grampian - U.S. Gazetteer (1990) : Grampian, PA (borough, FIPS 30280) Location: 40.96403 N, 78.61101 W Population (1990): 395 (175 housing units) Area: 0.8 sq km (land), 0.0 sq km (water) Zip code(s): 16838