Millersburg is a northern Bourbon county town located where US 68 crosses Hinkston Creek. It is named for John Miller, who founded the town on his farm in 1798. The post office opened in 1804 as Millersburgh, changing to Millersburg in 1893. The population in 2010 was 792.
The Millersburg Male and Female Collegiate Institute was established in 1856. In 1860 it became the Millersburg Female College, for women, and Kentucky Wesleyan College, for men. Kentucky Wesleyan moved to Winchester in 1890. The Millersburg Female College became Millersburg College in 1915 and was purchased by the Millersburg Military Institute in 1931.
The Millersburg Military Institute was established in 1893 and used the former campus of Kentucky Wesleyan. MMI closed in 2006 and the former MMI campus is now the home of the Forest Hill Military Academy.