Wellsville
- County:
- Allegany County
- County Seat:
- No
- Area (mi²):
- 2.424
- State:
- New York
Wellsville is a village located in Allegany County, New York. Wellsville has a 2026 population of 4,551. Wellsville is currently declining at a rate of -0.24% annually and its population has decreased by -1.75% since the most recent census, which recorded a population of 4,632 in 2020.