
Thayer
- County:
- Oregon County
- County Seat:
- No
- Area (mi²):
- 2.443
- State:
- Missouri
Thayer is a city located in Oregon County, Missouri. Thayer has a 2025 population of 1,913. Thayer is currently growing at a rate of 0.42% annually and its population has increased by 2.03% since the most recent census, which recorded a population of 1,875 in 2020.
The average household income in Thayer is $45,600 with a poverty rate of 36.47%. The median age in Thayer is 41.9 years: 40.7 years for males, and 43.1 years for females.