Fairfax is an unincorporated community in Highland County, in the U.S. state of Ohio.
Fairfax was founded in the 1830s, and named after Fairfax, Virginia, the native home of a first settler. A post office called Fairfax was established in 1851, and remained in operation until 1906.
Coordinates: 39°02′52″N 83°35′15″W / 39.04778°N 83.58750°W