33042 -- U.S. ZIP code Municipality (1990): SUMMERLAND KEY, Florida All ZIPs for this municipality (1990): 33042 Population (2000): 6097 Housing Units (2000): 4288 Land area (2000): 27.944717 sq. miles (72.376482 sq. km) Water area (2000): 9.626905 sq. miles (24.933568 sq. km) Total area (2000): 37.571622 sq. miles (97.310050 sq. km) Located within: Florida (FL) Location: 24.663121 N, 81.486940 W