33404 -- U.S. ZIP code Municipality (1990): RIVIERA BEACH, Florida All ZIPs for this municipality (1990): 33404 Population (2000): 29975 Housing Units (2000): 15417 Land area (2000): 9.669998 sq. miles (25.045180 sq. km) Water area (2000): 0.059112 sq. miles (0.153100 sq. km) Total area (2000): 9.729110 sq. miles (25.198280 sq. km) Located within: Florida (FL) Location: 26.782114 N, 80.065288 W