30257 -- U.S. ZIP code Municipality (1990): MILNER, Georgia All ZIPs for this municipality (1990): 30257 Population (2000): 3188 Housing Units (2000): 1248 Land area (2000): 40.142732 sq. miles (103.969195 sq. km) Water area (2000): 0.259230 sq. miles (0.671403 sq. km) Total area (2000): 40.401962 sq. miles (104.640598 sq. km) Located within: Georgia (GA) Location: 33.136567 N, 84.193867 W