Sumpter
- County:
- Baker County
- County Seat:
- No
- Area (mi²):
- 2.182
- State:
- Oregon
Sumpter is a city located in Baker County, Oregon. Sumpter has a 2026 population of 207. Sumpter is currently declining at a rate of -0.96% annually and its population has decreased by 0% since the most recent census, which recorded a population of 207 in 2020.