Founded in 1833, Lewis County is one of 114 counties in the state of Missouri. Historically, Lewis County was formed from Marion County. The city of Monticello is the county seat. With FIPS code of 111, Lewis County has a population of 10,000 and area of 505 square miles (1,308 km2).
List of all cities in Lewis County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Canton, MO | 63435 | 573 |
| Deer Ridge, MO | 63447 | 660 |
| Durham, MO | 63438 | 573 |
| Ewing, MO | 63440 | 573 |
| La Belle, MO | 63447 | 660 |
| La Grange, MO | 63448 | 573 |
| Lewistown, MO | 63452 | 573 |
| Monticello, MO | 63457 | 573 |
| Steffenville, MO | 63447 | 660 |
| Tolona, MO | 63452 | 573 |
| Williamstown, MO | 63473 | 573 |