- Location: Oregon County, Missouri
- Legal status: Fourth-class city
- Population: 205 (Change since 1990: +3.5%)
- Founded: 1882
- Name origin: Lake Koshkonong, Wisconsin
- Located along US 63 northwest of Thayer
- Latitude: 36°35'45" N (+36.5958)
- Longitude: 91°38'44" W (-91.6456)
- Elevation: 970 feet above sea level
- Public Land Survey: T. 22 N., R. 6 W., Sec. 5
- Civil township: Big Apple
- Land area: 0.19 square miles (120.6 acres)
As the crow flies, Koshkonong is...
Name origin
Named for Lake Koshkonong, Wisconsin
| Year | Population | Percent change |
|---|
| 1900 | 213 | -- |
| 1910 | 452 | +112.2% |
| 1920 | 414 | -8.4% |
| 1930 | 358 | -13.5% |
| 1940 | 282 | -21.2% |
| 1950 | 333 | +18.1% |
| 1960 | 478 | +43.5% |
| 1970 | 216 | -54.8% |
| 1980 | 245 | +13.4% |
| 1990 | 198 | -19.2% |
| 2000 | 205 | +3.5% |