Sullivan
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 1.133
- State:
- Wisconsin
Sullivan is a village located in Jefferson County, Wisconsin. Sullivan has a 2026 population of 653. Sullivan is currently growing at a rate of 0.62% annually and its population has increased by 0.15% since the most recent census, which recorded a population of 652 in 2020.