Derby, CT -- U.S. city in Connecticut Population (2000): 12391 Housing Units (2000): 5568 Land area (2000): 4.981069 sq. miles (12.900910 sq. km) Water area (2000): 0.401503 sq. miles (1.039887 sq. km) Total area (2000): 5.382572 sq. miles (13.940797 sq. km) FIPS code: 19480 Located within: Connecticut (CT), FIPS 09 Location: 41.323005 N, 73.084331 W ZIP Codes (1990): 06418 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Derby, CT Derby