Founded in 1836, Clark County is one of 114 counties in the state of Missouri. Historically, Clark County was formed from Lewis County. The city of Kahoka is the county seat. With FIPS code of 45, Clark County has a population of 6,736 and area of 507 square miles (1,313 km2).
List of all cities in Clark County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Alexandria, MO | 63430 | 660 |
| Ashton, MO | 63453 | 660 |
| Athens, MO | 63465 | 660 |
| Fairmont, MO | 63474 | 660 |
| Kahoka, MO | 63445 | 660 |
| Luray, MO | 63453 | 660 |
| Medill, MO | 63445 | 660 |
| Peaksville, MO | 63465 | 660 |
| Revere, MO | 63465 | 660 |
| Saint Francisville, MO | 63430 | 660 |
| Saint Patrick, MO | 63466 | 660 |
| Wayland, MO | 63472 | 660 |
| Wyaconda, MO | 63474 | 660 |