| Code postal | Commune | Population |
|---|---|---|
| 38220 | Laffrey | 400 |
| 38930 | Lalley | 217 |
| 38250 | Lans-en-Vercors | 2 648 |
| 38190 | Laval | 997 |
| 38350 | Lavaldens | 169 |
| 38710 | Lavars | 148 |
| 38270 | Lentiol | 220 |
| 38460 | Leyrieu | 764 |
| 38440 | Lieudieu | 320 |
| 38220 | Livet-et-Gavet | 1 227 |
| 38690 | Longechenal | 608 |
| 38660 | Lumbin | 2 094 |
| 38200 | Luzinay | 2 227 |