32071 -- U.S. ZIP code Municipality (1990): O BRIEN, Florida All ZIPs for this municipality (1990): 32071 Population (2000): 3111 Housing Units (2000): 1507 Land area (2000): 108.767812 sq. miles (281.707327 sq. km) Water area (2000): 0.007329 sq. miles (0.018983 sq. km) Total area (2000): 108.775141 sq. miles (281.726310 sq. km) Located within: Florida (FL) Location: 30.039096 N, 82.944814 W