Ullin
- County:
- Pulaski County
- County Seat:
- No
- Area (mi²):
- 2.811
- State:
- Illinois
Ullin is a village located in Pulaski County, Illinois. Ullin has a 2026 population of 460. Ullin is currently declining at a rate of -1.08% annually and its population has decreased by -3.97% since the most recent census, which recorded a population of 479 in 2020.