03833 -- U.S. ZIP code Municipality (1990): BRENTWOOD, New Hampshire All ZIPs for this municipality (1990): 03833 Population (2000): 19154 Housing Units (2000): 7702 Land area (2000): 48.418295 sq. miles (125.402804 sq. km) Water area (2000): 0.539468 sq. miles (1.397215 sq. km) Total area (2000): 48.957763 sq. miles (126.800019 sq. km) Located within: New Hampshire (NH) Location: 42.973783 N, 70.976659 W