| COM12 | Rodez Comtal | 15000 | | | | | |
| MIL12 | Millau | 13088 | | | | | |
| FOR12 | Rodez Forveille | 9135 | | | | | |
| VRO12 | Villefranche-de-Rouergue | 7378 | | | | | |
| SAF12 | Saint-Affrique | 6000 | | | | | |
| DEC12 | Decazeville | 5192 | | | | | |
| ESP12 | Espalion | 3049 | | | | | |
| CDG12 | Capdenac-Gare | 2802 | | | | | |
| PRI12 | Luc-la-Primaube La Primaube | 2585 | | | | | |
| GUA12 | Aubin Le Gua | 2548 | | | | | |
| BAR12 | Baraqueville | 2444 | | | | | |
| NAG12 | Naucelle Gare | 1874 | | | | | |
| SEB12 | Sébazac-Concourès | 1818 | | | | | |
| LAI12 | Laissac | 1769 | | | | | |
| BOZ12 | Bozouls | 1754 | | | | | |
| SEV12 | Sévérac-le-Château | 1740 | | | | | |
| STZ12 | Saint-Geniez-d'Olt | 1666 | | | | | |
| LAG12 | Laguiole | 1581 | | | | | |
| MCL12 | Marcillac-Vallon | 1541 | | | | | |
| REQ12 | Réquista | 1519 | | | | | |
| AGU12 | Aguessac | 1392 | | | | | |
| VLY12 | Valady | 1389 | | | | | |
| RIG12 | Rignac | 1328 | | | | | |
| FIR12 | Firmi | 1305 | | | | | |
| MDZ12 | Mur-de-Barrez | 1275 | | | | | |
| MBZ12 | Montbazens | 1272 | | | | | |
| RYX12 | Rieupeyroux | 1217 | | | | | |
| VVE12 | Villeneuve | 1181 | | | | | |
| PSA12 | Pont-de-Salars | 1120 | | | | | |
| BOI12 | Boisse-Penchot | 1013 | | | | | |
| ENT12 | Entraygues-sur-Truyère | 986 | | | | | |
| SSE12 | Saint-Sernin-sur-Rance | 975 | | | | | |
| FOU12 | La Fouillade | 935 | | | | | |
| FLA12 | Flavin | 933 | | | | | |
| SGE12 | Sainte-Geneviève-sur-Argence | 924 | | | | | |
| SCU12 | Salles-Curan | 894 | | | | | |
| SCY12 | Saint-Cyprien-sur-Dourdou | 886 | | | | | |
| CBO12 | Cassagnes-Bégonhès | 876 | | | | | |
| STA12 | Saint-Amans-des-Cots | 850 | | | | | |
| SGL12 | Saint-Georges-de-Luzençon | 843 | | | | | |
| ROQ12 | Roquefort-sur-Soulzon | 817 | | | | | |
| VPA12 | Villefranche-de-Panat | 779 | | | | | |
| DRU12 | Druelle | 765 | | | | | |
| NAN12 | Nant | 758 | | | | | |
| AGR12 | Saint-Parthem Port D'agres | 753 | | | | | |
| CAV12 | La Cavalerie | 748 | | | | | |
| EST12 | Estaing | 718 | | | | | |
| SJB12 | Saint-Jean-du-Bruel | 709 | | | | | |
| LEV12 | La Bastide-l'Évêque | 696 | | | | | |
| SN812 (COM12) | Rodez Sauniers | 694 | | | | | |
| SSC12 | Salles-la-Source | 693 | | | | | |
| SVP12 | La Salvetat-Peyralès | 673 | | | | | |
| BE712 | Belmont-sur-Rance | 657 | | | | | |
| NAY12 | Le Nayrac | 647 | | | | | |
| OLT12 | Saint-Côme-d'Olt | 646 | | | | | |
| LNL12 | Lanuéjouls | 627 | | | | | |
| REC12 | Recoules-Prévinquières | 608 | | | | | |
| CPI12 | Coupiac | 603 | | | | | |
| CMR12 | Camarès | 588 | | | | | |
| BRO12 | Broquiès | 585 | | | | | |
| OER12 | Ols-et-Rinhodes | 574 | | | | | |
| NAJ12 | Najac | 574 | | | | | |
| SVA12 | Sanvensa | 564 | | | | | |
| GAG12 | Montrozier Gages | 559 | | | | | |
| QUE12 | Montlaur Querbes | 547 | | | | | |
| L2C12 | Luc-la-Primaube | 539 | | | | | |
| LUP12 | Causse-et-Diège Loupiac | 535 | | | | | |
| FLO12 | Monteils Floirac | 532 | | | | | |
| TRM12 | Trémouilles | 523 | | | | | |
| AGE12 | Agen-d'Aveyron | 519 | | | | | |
| MAL12 | Maleville | 487 | | | | | |
| MEM12 | Vailhourles Memer | 487 | | | | | |
| SDR12 | Sauveterre-de-Rouergue | 485 | | | | | |
| PEY12 | Peyreleau | 478 | | | | | |
| SCH12 | Saint-Chély-d'Aubrac | 477 | | | | | |
| B7N12 (COM12) | Rodez Bourran | 468 | | | | | |
| CB912 | Colombiès | 450 | | | | | |
| SRO12 | Saint-Rome-de-Tarn | 448 | | | | | |
| ALP12 | Alpuech | 444 | | | | | |
| VMT12 | Villecomtal | 430 | | | | | |
| SBE12 | Saint-Beauzély | 426 | | | | | |
| LCB12 | Lacroix-Barrez | 414 | | | | | |
| FOD12 | Fondamente | 412 | | | | | |
| GL212 | Galgan | 407 | | | | | |
| MTI12 | Martiel | 397 | | | | | |
| SEN12 | Sénergues | 380 | | | | | |
| MCT12 | Muret-le-Château | 378 | | | | | |
| LED12 | Lédergues | 369 | | | | | |
| LUN12 | Lunac | 349 | | | | | |
| SRC12 | Saint-Rome-de-Cernon | 339 | | | | | |
| SLM12 | Salmiech | 335 | | | | | |
| PAC12 | Vaureilles Pachins | 330 | | | | | |
| VEL12 | Versols-et-Lapeyre | 316 | | | | | |
| SEG12 | Ségur | 314 | | | | | |
| SL712 | Saint-Laurent-d'Olt | 314 | | | | | |
| CT912 | Calmont | 305 | | | | | |
| AUZ12 | Auzits | 300 | | | | | |
| SLE12 | Saint-Léons | 278 | | | | | |
| AS212 | Asprières | 271 | | | | | |
| VIM12 | Vimenet | 262 | | | | | |
| CPC12 | Campuac | 261 | | | | | |
| ARV12 | Arvieu | 259 | | | | | |
| SML12 | Saint-Martin-de-Lenne | 258 | | | | | |
| CED12 | Causse-et-Diège | 249 | | | | | |
| PDA12 | Prades-d'Aubrac | 248 | | | | | |
| DRQ12 | Durenque | 245 | | | | | |
| SJD12 | Saint-Jean-et-Saint-Paul Saint Jean D'alcas | 243 | | | | | |
| CAC12 | Campagnac | 243 | | | | | |
| THE12 | Thérondels | 239 | | | | | |
| SHI12 | Saint-Hippolyte | 238 | | | | | |
| SC312 | Salles-Courbatiès | 234 | | | | | |
| BZN12 | Rodelle Bezonnes | 233 | | | | | |
| MYN12 | Mayran | 230 | | | | | |
| SCR12 | Sainte-Croix | 219 | | | | | |
| CMP12 | Compolibat | 219 | | | | | |
| RUL12 | Rullac-Saint-Cirq Rulhac | 218 | | | | | |
| CBZ12 | Colombiès Combrouze | 217 | | | | | |
| CUR12 | Curan | 217 | | | | | |
| VEZ12 | Vézins-de-Lévézou | 216 | | | | | |
| GRV12 | Grand-Vabre Grandvabre | 215 | | | | | |
| MOY12 | Moyrazès | 214 | | | | | |
| CT712 | Cantoin | 214 | | | | | |
| BA812 | Balsac | 213 | | | | | |
| SVI12 | Saint-Victor-et-Melvieu | 211 | | | | | |
| CN412 | Cornus | 210 | | | | | |
| COQ12 | Conques | 209 | | | | | |
| SSL12 | Saint-Saturnin-de-Lenne | 204 | | | | | |
| BO612 | Rivière-sur-Tarn Boyne | 202 | | | | | |
| QUI12 | Quins | 201 | | | | | |
| MNJ12 | Montjaux | 201 | | | | | |
| CPN12 | Crespin | 199 | | | | | |
| CM412 | Montagnol Cemones | 194 | | | | | |
| VDT12 | Viala-du-Tarn | 193 | | | | | |
| ABB12 | Druelle Abbas | 192 | | | | | |
| PRD12 | Pradinas | 192 | | | | | |
| LTR12 | Le Truel | 191 | | | | | |
| ALJ12 | Almont-les-Junies | 188 | | | | | |
| CSA12 | Canet-de-Salars | 185 | | | | | |
| GTR12 | Goutrens | 182 | | | | | |
| BNZ12 | Bournazel | 181 | | | | | |
| ELV12 | Calmels-et-le-Viala Calmels Le Viala | 128 | | | | | |
| ALR12 | Alrance | 128 | | | | | |
| BSQ12 | Brusque | 128 | | | | | |
| LBF12 | La Capelle-Bleys | 128 | | | | | |
| NDA12 | Arvieu Notre Dame D'aures | 128 | | | | | |
| BNR12 | Campouriez Banhars | 128 | | | | | |
| BCH12 | Brousse-le-Château | 128 | | | | | |
| SAG12 | Condom-d'Aubrac Salgues | 127 | | | | | |
| HOS12 | L'Hospitalet-du-Larzac | 127 | | | | | |
| HCY12 | Le Cayrol | 127 | | | | | |
| GOL12 | Golinhac | 127 | | | | | |
| FAY12 | Fayet | 127 | | | | | |
| CEN12 | Centrès | 127 | | | | | |
| CRU12 | Cruéjouls | 127 | | | | | |
| CMA12 | Castelnau-de-Mandailles | 127 | | | | | |
| MAV12 | Montclar | 126 | | | | | |
| LE712 | Lestrade-et-Thouels | 126 | | | | | |
| PL712 | Plaisance | 126 | | | | | |
| PIE12 | La Roque-Sainte-Marguerite Pierrefiche Du Larzac | 126 | | | | | |
| MTZ12 | Montrozier | 126 | | | | | |
| LST12 | Lassouts | 126 | | | | | |
| MRS12 | Murasson | 126 | | | | | |
| MPX12 | Mounes-Prohencoux | 126 | | | | | |
| VTI12 | Vabre-Tizac | 125 | | | | | |
| L2G12 | La Selve Lagarde | 125 | | | | | |
| LUL12 | Saint-Félix-de-Lunel | 125 | | | | | |
| ENG12 | Sévérac-le-Château Engayresque | 125 | | | | | |
| SZS12 | Saint-André-de-Vézines | 125 | | | | | |
| LSE12 | La Selve | 125 | | | | | |
| JU412 | Saint-Juéry | 125 | | | | | |
| NIG12 | Thérondels Nigresserre | 100 | | | | | |
| LRO12 | Vézins-de-Lévézou Le Roucous | 100 | | | | | |
| LCL12 | Le Clapier | 100 | | | | | |
Taille moyenne des NRA : 865 lignes
Taille du NRA médian : 378 lignes
149 629 lignes au total