Alton
- County:
- Oregon County
- County Seat:
- Yes
- Area (mi²):
- 1.569
- State:
- Missouri
Alton is a city located in Oregon County, Missouri. Alton has a 2026 population of 702. It is also the county seat of Oregon County. Alton is currently declining at a rate of -0.28% annually but its population has increased by 0.29% since the most recent census, which recorded a population of 700 in 2020.