| VIR91 | Viry-Châtillon | 46000 | | | | | | |
| EVR91 | Évry | 31000 | | | | | | |
| LJU91 | Longjumeau | 25000 | | | | | | |
| BUR91 | Bures-sur-Yvette | 25000 | | | | | | |
| VIG91 | Vigneux-sur-Seine | 25000 | | | | | | |
| SGE91 | Sainte-Geneviève-des-Bois | 24000 | | | | | | |
| COR91 | Corbeil-Essonnes | 23000 | | | | | | |
| MRY91 | Montlhéry | 21000 | | | | | | |
| RIS91 | Ris-Orangis | 20000 | | | | | | |
| MOR91 | Sainte-Geneviève-des-Bois Morsang | 18000 | | | | | | |
| BTY91 | Brétigny-sur-Orge | 18000 | | | | | | |
| SGC91 | Saint-Germain-lès-Corbeil | 17000 | | | | | | |
| BRN91 | Brunoy | 17000 | | | | | | |
| ATM91 | Athis-Mons Essonne | 16000 | | | | | | |
| MAS91 | Massy | 16000 | | | | | | |
| ARP91 | Arpajon | 16000 | | | | | | |
| VER91 | Massy Verrieres | 15000 | | | | | | |
| YER91 | Yerres | 14000 | | | | | | |
| ETA91 | Étampes | 14000 | | | | | | |
| CMZ91 | Chilly-Mazarin | 14000 | | | | | | |
| VBO91 | Villebon-sur-Yvette | 13000 | | | | | | |
| ATH91 | Athis-Mons Val de Marne | 11000 | | | | | | |
| MTG91 | Montgeron | 11000 | | | | | | |
| BSY91 | Boussy-Saint-Antoine | 9000 | | | | | | |
| SAC91 | Saclay | 9000 | | | | | | |
| LIS91 | Lisses | 9000 | | | | | | |
| BAU91 | Massy Baudot | 8000 | | | | | | |
| GOV91 | Gometz-la-Ville | 6000 | | | | | | |
| BSA91 | Boussy-Saint-Antoine Val de Marne | 3200 | | | | | | |
| BIE91 | Bièvres | 2800 | | | | | | |
Taille moyenne des NRA : 16 567 lignes
Taille du NRA médian : 16 000 lignes
497 000 lignes au total