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Area Geografica:
Extensión de la superficie de la Diócesis: 11.319,6 kms. cuadrados, correspondiente a la Región de Murcia, con 45 municipios.
Limita con las Diócesis de Orihuela-Alicante, Albacete, Guadix-Baza y Almería.
Población:
Evolucion de la población desde 1960 (INE)
| Año | Población |
| 1960 | 800.463 |
| 1970 | 832.313 |
| 1980 | 949.928 |
| 1982 | 970.485 |
| 1984 | 992.138 |
| 1985 | 1.002.226 |
| 1986 | 1.011.111 |
| 1987 | 1.018.882 |
| 1988 | 1.026.373 |
| 1989 | 1.034.195 |
| 1990 | 1.041.760 |
| 1991 | 1.048.984 |
| 1992 | 1.056.603 |
| 1993 | 1.063.878 |
| 1994 | 1.070.795 |
| 1995 | 1.077.583 |
| 1996 | 1.084.394 |
| 1997 | 1.091.003 |
| 1998 | 1.115.068 |
| 1999 | 1.130.962 |
| 2000 | 1.149.328 |
| 2001 | 1.190.378 |
| 2002 | 1.226.993 |
| 2003 | 1.269.230 |
| 2004 | 1.294.694 |
| 2005 | 1.335.792 |
| 2006 | 1.370.306 |
| 2007 | 1.370.306 |
Datos de la Población por municipios al 1 de Enero del 2007
| Municipio | Total | Varones | Mujeres |
| Abanilla | 6.568 | 3.350 | 3.218 |
| Abarán | 12.968 | 6.548 | 6.420 |
| Águilas | 33.134 | 16.670 | 16.464 |
| Albudeite | 1.413 | 709 | 704 |
| Alcantarilla | 39.636 | 19.828 | 19.808 |
| Alcáceres (Los) | 14.077 | 7.429 | 6.648 |
| Aledo | 1.046 | 536 | 510 |
| Alguazas | 8.572 | 4.464 | 4.108 |
| Alhama | 18.996 | 9.794 | 9.202 |
| Archena | 17.634 | 9.062 | 8.572 |
| Beniel | 10.294 | 5.450 | 4.844 |
| Blanca | 6.119 | 3.092 | 3.027 |
| Bullas | 12.020 | 6.113 | 5.907 |
| Calasparra | 10.282 | 5.233 | 5.049 |
| Campos del Rio | 2.182 | 1.052 | 1.130 |
| Carvaca de la Cruz | 25.688 | 12.913 | 12.775 |
| Cartagena | 207.286 | 104.859 | 102.427 |
| Cehegín | 15.798 | 7.942 | 7.856 |
| Ceutí | 9.185 | 4.694 | 4.491 |
| Cieza | 34.898 | 17.554 | 17.344 |
| Fortuna | 8.939 | 4.719 | 4.220 |
| fuente Álamo | 14.400 | 7.641 | 6.759 |
| Jumilla | 24.596 | 12.698 | 11.898 |
| Librilla | 4.378 | 2.196 | 2.182 |
| Lorca | 89.606 | 46.926 | 42.680 |
| Lorquí | 6.714 | 3.470 | 3.244 |
| Mazarrón | 32.616 | 17.324 | 15.292 |
| Molina de Segura | 59.365 | 29.984 | 29.381 |
| Moratalla | 8.379 | 4.255 | 4.124 |
| Mula | 16.570 | 8.564 | 8.006 |
| Murcia | 422.861 | 210.377 | 212.484 |
| Ojós | 626 | 317 | 309 |
| Pliego | 3.864 | 2.012 | 1.852 |
| Puerto Lumbreras | 12.964 | 6.456 | 6.508 |
| Ricote | 1.531 | 771 | 760 |
| San Javier | 29.167 | 15.039 | 14.128 |
| San Pedro del Pinatar | 22.217 | 11.342 | 10.875 |
| Santomera | 14.323 | 7.307 | 7.016 |
| Torre Pacheco | 29.187 | 15.634 | 13.553 |
| Torres de Cotillas | 19.611 | 10.061 | 9.550 |
| Totana | 28.742 | 14.871 | 13.871 |
| Ulea | 991 | 518 | 473 |
| Unión (La) | 16.471 | 8.273 | 8.198 |
| Villanueva del Segura | 2.042 | 999 | 1.043 |
| Yecla | 34.161 | 17.280 | 16.881 |
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| Totales | 1.392.117 |
| Varones | 706.326 |
| Mujeres | 685.791 |
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