The canton Saint-Dizier-1 has 11 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 52448 | Saint-Dizier | 22 858 |
| 52182 | Éclaron-Braucourt-Sainte-Livière | 2 008 |
| 52534 | Villiers-en-Lieu | 1 469 |
| 52244 | Humbécourt | 761 |
| 52294 | Louvemont | 694 |
| 52500 | Valcourt | 596 |
| 52386 | Perthes | 518 |
| 52327 | Moëslains | 467 |
| 52006 | Allichamps | 348 |
| 52235 | Hallignicourt | 238 |
| 52267 | Laneuville-au-Pont | 233 |