Mount Vernon
- County:
- Knox County
- County Seat:
- Yes
- Area (mi²):
- 9.92
- State:
- Ohio
Mount Vernon is a city located in Knox County, Ohio. Mount Vernon has a 2026 population of 17,329. It is also the county seat of Knox County. Mount Vernon is currently growing at a rate of 2.61% annually and its population has increased by 1.56% since the most recent census, which recorded a population of 17,063 in 2020.