1 definition found mahopac - U.S. Gazetteer (1990) : Mahopac, NY (CDP, FIPS 44534) Location: 41.36953 N, 73.74159 W Population (1990): 7755 (2972 housing units) Area: 13.8 sq km (land), 2.9 sq km (water) Zip code(s): 10541