| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Jagny | city | France | 49.08 | 2.44 | 830 | 33888 | |
| Jagny-sous-Bois | city | France | 49.08 | 2.44 | 830 | 33888 | |
| Jambville | city | France | 49.05 | 1.85 | 200 | 14071 | |
| Janville | city | France | 48.51 | 2.27 | 288 | 19218 | |
| Janville-sur-Juine | city | France | 48.51 | 2.27 | 288 | 19218 | |
| Janvry | city | France | 48.65 | 2.15 | 830 | 57518 | |
| Jaugy | city | France | 48.36 | 2.15 | 830 | 6736 | |
| Jeufosse | city | France | 49.04 | 1.55 | 328 | 13965 | |
| Joinville | city | France | 48.83 | 2.47 | 137 | 696558 | |
| Joinville-le-Pont | city | France | 48.83 | 2.47 | 137 | 696558 | |
| Jouars | city | France | 48.79 | 1.90 | 295 | 60710 | |
| Jouars-Pontchartrain | city | France | 48.79 | 1.90 | 295 | 60710 | |
| Jouy | city | France | 48.76 | 2.17 | 830 | 127969 | |
| Jouy | city | France | 48.98 | 1.65 | 298 | 46414 | |
| Jouy | city | France | 48.45 | 2.36 | 406 | 15593 | |
| Jouy | city | France | 49.01 | 2.04 | 164 | 173269 | |
| Jouy-Mauvoisin | city | France | 48.98 | 1.65 | 298 | 46414 | |
| Jouy-en-Josas | city | France | 48.76 | 2.17 | 830 | 127969 | |
| Jouy-le-Moutier | city | France | 49.01 | 2.04 | 164 | 173269 | |
| Jumeauville | city | France | 48.91 | 1.79 | 387 | 15506 | |
| Juvisy | city | France | 48.68 | 2.38 | 114 | 264988 | |
| Juvisy-sur-Orge | city | France | 48.68 | 2.38 | 114 | 264988 | |
| Juziers | city | France | 48.99 | 1.85 | 65 | 50723 |