The canton Sedan-1 has 9 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 08409 | Sedan | 16 667 |
| 08491 | Vrigne aux Bois | 3 518 |
| 08142 | Donchery | 1 989 |
| 08331 | Noyers-Pont-Maugis | 673 |
| 08119 | Cheveuges | 468 |
| 08494 | Wadelincourt | 447 |
| 08445 | Thelonne | 405 |
| 08481 | Villers-sur-Bar | 234 |
| 08377 | Saint-Aignan | 152 |