Jefferson is an unincorporated community in Washington Township, Clinton County, Indiana.

It early on had a post office, which handled mail bi-weekly, and a store operated by Abner Baker and Aaron Southard which sold supplies both to the early pioneers and to the Indians.

John Pence offered 60 acres (240,000 m2) of land and $100 for the establishment of the seat at Frankfort, and the commissioners appointed to select the site accepted.

[5] A post office was established at Jefferson in 1830, and remained in operation until it was discontinued in 1905.

[6] Jefferson was the 1958 birthplace of the now defunct neofascist National States' Rights Party.