31790 -- U.S. ZIP code Municipality (1990): SYCAMORE, Georgia All ZIPs for this municipality (1990): 31790 Population (2000): 2039 Housing Units (2000): 790 Land area (2000): 64.008771 sq. miles (165.781948 sq. km) Water area (2000): 1.367151 sq. miles (3.540904 sq. km) Total area (2000): 65.375922 sq. miles (169.322852 sq. km) Located within: Georgia (GA) Location: 31.652542 N, 83.579348 W