Oregon County, Missouri Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Thayer11,9051,8750.37%7802.4City
Alton27067010.14%4501.6City
Koshkonong31991950.51%1,1120.2Town

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Oregon County, Missouri?

Thayer is the largest city in Oregon County.

What is the smallest city in Oregon County, Missouri?

Koshkonong is the smallest city in Oregon County.

How many cities are in Oregon County?

There are 3 cities in Oregon County, Missouri.

Frequently Asked Questions