[2] Its county seat and largest city is Washington Court House.

[3] The county was named for the Marquis de Lafayette,[4] a Frenchman who was an officer in the American Army in the Revolution, when established on March 1, 1810.

It was named after Marie-Joseph Motier, Marquis de La Fayette, a French general and politician who took the side of the Colonials during the American Revolutionary War and who played an important role in the French Revolution.

[citation needed] Xenia-Jamestown Connector - Opened in 2022, this trail allows travel from Xenia to Octa.

[9] As of the census[15] of 2010, there were 29,030 people, 11,436 households, and 7,834 families living in the county.

25.80% of all households were made up of individuals, and 10.34% had someone living alone who was 65 years of age or older.

As of the 2010 United States Census, there were 29,030 people, 11,436 households, and 7,834 families living in the county.

[19] Fayette County is a stronghold of the Republican party in presidential elections; it has voted Democratic only four times since 1856.

As of 2025, Fayette County's elected commissioners are Tony Anderson, Donnie Fleak, and Jim Garland.