05489 -- U.S. ZIP code Municipality (1990): UNDERHILL, Vermont All ZIPs for this municipality (1990): 05489 Population (2000): 3166 Housing Units (2000): 1157 Land area (2000): 53.099369 sq. miles (137.526728 sq. km) Water area (2000): 0.048341 sq. miles (0.125202 sq. km) Total area (2000): 53.147710 sq. miles (137.651930 sq. km) Located within: Vermont (VT) Location: 44.546538 N, 72.926497 W