31821 -- U.S. ZIP code Municipality (1990): OMAHA, Georgia All ZIPs for this municipality (1990): 31821 Population (2000): 364 Housing Units (2000): 184 Land area (2000): 92.280399 sq. miles (239.005125 sq. km) Water area (2000): 0.352188 sq. miles (0.912162 sq. km) Total area (2000): 92.632587 sq. miles (239.917287 sq. km) Located within: Georgia (GA) Location: 32.134200 N, 84.984992 W