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is a city in Clinton County, Indiana, United States. The population was 16,662 at the 2000 census. The city is the county seat of Clinton County.
Brothers John, William and Nicholas Pence, previously of Warren County, Ohio, settled on the land on which Frankfort now stands in 1829, having entered it from the government in 1827 and 1828. In 1830, the brothers donated of the land to the county commissioners, a donation which led to the establishment of the county seat at that site rather than in Jefferson, a community which had also been vying for the honor. The new town was named Frankfort at the brothers' request and honors their German great-grandparents' home of Frankfurt am Main.
The town of Frankfort was laid off on the tract by William Douglass, the county agent, and the plat filed on June 8, 1830. The original plat consisted of 64 lots in eight blocks surrounding a public square where the courthouse now stands. The county board paid contractors Allen & Michael the sum of $20 to erect the first courthouse, a one-and-a-half story temporary structure made a logs hewn from trees that grew on the square and surrounding streets. Its replacement was built by contractor John Elder in 1837-1838 for $12,0000 and operated for 45 years. Indianapolis architect George W. Bunting in 1881 designed the third courthouse, a tall structure built of Indiana limestone by contractors Farman & Pearce for approximately $200,000. Its cornerstone was laid September 2, 1882.