Trotwood, OH -- U.S. city in Ohio Population (2000): 27420 Housing Units (2000): 12020 Land area (2000): 30.529755 sq. miles (79.071700 sq. km) Water area (2000): 0.014119 sq. miles (0.036567 sq. km) Total area (2000): 30.543874 sq. miles (79.108267 sq. km) FIPS code: 77504 Located within: Ohio (OH), FIPS 39 Location: 39.794807 N, 84.289892 W ZIP Codes (1990): 45416 45426 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Trotwood, OH Trotwood