Middletown, DE -- U.S. town in Delaware Population (2000): 6161 Housing Units (2000): 2514 Land area (2000): 6.401606 sq. miles (16.580084 sq. km) Water area (2000): 0.006449 sq. miles (0.016702 sq. km) Total area (2000): 6.408055 sq. miles (16.596786 sq. km) FIPS code: 47030 Located within: Delaware (DE), FIPS 10 Location: 39.454352 N, 75.713816 W ZIP Codes (1990): 19709 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Middletown, DE Middletown