33811 -- U.S. ZIP code Municipality (1990): SOUTHSIDE, Florida All ZIPs for this municipality (1990): 33811 33813 Population (2000): 16176 Housing Units (2000): 6622 Land area (2000): 28.040578 sq. miles (72.624761 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 28.040578 sq. miles (72.624761 sq. km) Located within: Florida (FL) Location: 27.978316 N, 82.008415 W