03450 -- U.S. ZIP code Municipality (1990): HARRISVILLE, New Hampshire All ZIPs for this municipality (1990): 03450 Population (2000): 584 Housing Units (2000): 380 Land area (2000): 10.336719 sq. miles (26.771977 sq. km) Water area (2000): 0.669982 sq. miles (1.735245 sq. km) Total area (2000): 11.006701 sq. miles (28.507222 sq. km) Located within: New Hampshire (NH) Location: 42.941175 N, 72.060432 W