Frankfort
- County:
- Clinton County
- County Seat:
- Yes
- Area (mi²):
- 9.844
- State:
- Indiana
Frankfort is a city located in Clinton County, Indiana. Frankfort has a 2026 population of 16,459. It is also the county seat of Clinton County. Frankfort is currently declining at a rate of -0.14% annually and its population has decreased by -1.41% since the most recent census, which recorded a population of 16,695 in 2020.