How many people live in Oregon County, MO?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 8,700 people living in Oregon County, MO. That makes Oregon County the 94th-most populous county in Missouri. It is home to 0.14% of people living in the state.
8.7K
population of Oregon County, MO (2024)
0.14%
County share of the Missouri population (2024)
About 8,700 people lived in Oregon County, MO in 2024.
Population estimates, 2000–2024
What are Oregon County, MO’s age demographics?
About 2,000 Oregon County, MO residents are aged 65 and older in 2024. That represents 23.4% of its population. For comparison, the age group represents 18.8% of Missouri’s population and 18% in the US overall.
Another 2,000 Oregon County residents, or 23% of the population, were children under 18. For comparison, the age group represents 22% of Missouri’s population and 21.6% in the US overall.
A lower share of Oregon County, MO's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Oregon County, MO’s racial and ethnic demographics?
Non-Hispanic white residents make up 92.7% of the Oregon County population, higher than the national share of 57.5%. Oregon County also has a larger share of people identifying as non-Hispanic two or more races (2.6%) than the US overall (2.5%).
In contrast, Oregon County’s Hispanic population accounts for 2%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.57% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Oregon County, MO has a higher share of a non-Hispanic white population than Missouri as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Oregon County, MO is Thayer with about 1,900 residents in 2024.
Cities and towns in Oregon County, MO ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Thayer | 1,904 |
| 2. | Alton | 702 |
| 3. | Koshkonong | 196 |
| 4. | Balance of Oregon County | 5,897 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
