06320 -- U.S. ZIP code Municipality (1990): NEW LONDON, Connecticut All ZIPs for this municipality (1990): 06320 Population (2000): 25671 Housing Units (2000): 11560 Land area (2000): 5.537916 sq. miles (14.343136 sq. km) Water area (2000): 0.021167 sq. miles (0.054821 sq. km) Total area (2000): 5.559083 sq. miles (14.397957 sq. km) Located within: Connecticut (CT) Location: 41.352498 N, 72.103389 W