31770 -- U.S. ZIP code Municipality (1990): NEWTON, Georgia All ZIPs for this municipality (1990): 31770 Population (2000): 2805 Housing Units (2000): 1190 Land area (2000): 209.743605 sq. miles (543.233420 sq. km) Water area (2000): 2.021804 sq. miles (5.236449 sq. km) Total area (2000): 211.765409 sq. miles (548.469869 sq. km) Located within: Georgia (GA) Location: 31.333490 N, 84.362694 W