30739 -- U.S. ZIP code Municipality (1990): ROCK SPRING, Georgia All ZIPs for this municipality (1990): 30739 Population (2000): 3708 Housing Units (2000): 1382 Land area (2000): 27.333744 sq. miles (70.794068 sq. km) Water area (2000): 0.061339 sq. miles (0.158866 sq. km) Total area (2000): 27.395083 sq. miles (70.952934 sq. km) Located within: Georgia (GA) Location: 34.801988 N, 85.219567 W