The state of Missouri, USA is currently served by a total of 6 area codes:
| City | County | Area code(s) |
|---|---|---|
| Ballwin | St Louis | 636 |
| Blue Springs | Jackson | 816 |
| Cape Girardeau | Cape Girardeau | 573 |
| Chesterfield | St Louis | 636 |
| Columbia | Boone | 573 |
| Florissant | St Louis | 314 |
| Independence | Jackson | 816 |
| Jefferson City | Cole | 573 |
| Joplin | Jasper | 417 |
| Kansas City | Platte | 816 |
| Lee's Summit | Jackson | 816 |
| Liberty | Clay | 816 |
| O'Fallon | St Charles | 636 |
| Oakville | St Louis | 314 |
| Springfield | Greene | 417 |
| St Charles | St Charles | 636 |
| St Joseph | Buchanan | 816 |
| St Louis | St Louis | 314 |
| St Peters | St Charles | 636 |
| University City | St Louis | 314 |
| Wentzville | St Charles | 636 |