Founded in 1841, Osage County is one of 114 counties in the state of Missouri. Historically, Osage County was formed from Gasconade County. The city of Linn is the county seat. With FIPS code of 151, Osage County has a population of 13,379 and area of 606 square miles (1,570 km2).
List of all cities in Osage County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Argyle, MO | 65001 | 573 |
| Babbtown, MO | 65058 | 573 |
| 65085 | 573 | |
| Bonnots Mill, MO | 65016 | 573 |
| Chamois, MO | 65024 | 573 |
| Folk, MO | 65085 | 573 |
| Frankenstein, MO | 65016 | 573 |
| Freeburg, MO | 65035 | 573 |
| Freedom, MO | 65024 | 573 |
| Koeltztown, MO | 65048 | 573 |
| Linn, MO | 65051 | 573 |
| Loose Creek, MO | 65054 | 573 |
| Luystown, MO | 65016 | 573 |
| Meta, MO | 65058 | 573 |
| Mint Hill, MO | 65024 | 573 |
| Rich Fountain, MO | 65035 | 573 |
| Vancleve, MO | 65058 | 573 |
| Westphalia, MO | 65085 | 573 |