
Sullivan
- County:
- Ashland County
- County Seat:
- No
- Area (mi²):
- 4.142
- State:
- Ohio
Sullivan is a CDP located in Ashland County, Ohio. Sullivan has a 2025 population of 1,158. Sullivan is currently growing at a rate of 7.22% annually and its population has increased by 49.61% since the most recent census, which recorded a population of 774 in 2020.
The average household income in Sullivan is $80,130 with a poverty rate of 7.02%. The median age in Sullivan is 60.2 years: 57.7 years for males, and 60.4 years for females.