Troy, OH -- U.S. city in Ohio Population (2000): 21999 Housing Units (2000): 9497 Land area (2000): 9.700614 sq. miles (25.124474 sq. km) Water area (2000): 0.067445 sq. miles (0.174682 sq. km) Total area (2000): 9.768059 sq. miles (25.299156 sq. km) FIPS code: 77588 Located within: Ohio (OH), FIPS 39 Location: 40.041621 N, 84.208627 W ZIP Codes (1990): 45373 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Troy, OH Troy