Oregon County is a county located in the southern portion of the U.S. state of Missouri. As of the 2020 census, the population was 8,635. Its county seat is Alton. The county was officially organized on February 14, 1845, and was named for the Oregon Country, a region shared at the time between the United Kingdom and the United States.
- Country
- United States
- Inception
- February 14, 1845
