Founded in 1843, DeKalb County is one of 114 counties in the state of Missouri. Historically, DeKalb County was formed from Clinton County. The city of Maysville is the county seat. With FIPS code of 63, DeKalb County has a population of 11,098 and area of 424 square miles (1,098 km2).
List of all cities in DeKalb County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Amity, MO | 64422 | 816/975 |
| Clarksdale, MO | 64430 | 816/975 |
| Fairport, MO | 64469 | 816/975 |
| Hemple, MO | 64490 | 816/975 |
| Maysville, MO | 64469 | 816/975 |
| Osborn, MO | 64474 | 816/975 |
| Stewartsville, MO | 64490 | 816/975 |
| Union Star, MO | 64494 | 816/975 |
| Weatherby, MO | 64497 | 816/975 |