| Castel Gandolfo to Marsciano | 82.45 mi (132.69 km) |
| Castel Gandolfo to Martano | 313.35 mi (504.29 km) |
| Castel Gandolfo to Martellago | 263.70 mi (424.38 km) |
| Castel Gandolfo to Martina Franca | 253.77 mi (408.40 km) |
| Castel Gandolfo to Martinengo | 300.91 mi (484.27 km) |
| Castel Gandolfo to Martinsicuro | 101.69 mi (163.65 km) |
| Castel Gandolfo to Mascali | 307.51 mi (494.89 km) |
| Castel Gandolfo to Mascalucia | 315.70 mi (508.08 km) |
| Castel Gandolfo to Masera di Padova | 249.76 mi (401.95 km) |
| Castel Gandolfo to Maserada sul Piave | 277.09 mi (445.94 km) |
| Castel Gandolfo to Massa | 202.98 mi (326.67 km) |
| Castel Gandolfo to Massa Lombarda | 191.46 mi (308.12 km) |
| Castel Gandolfo to Massafra | 245.72 mi (395.45 km) |
| Castel Gandolfo to Massalubrense | 117.87 mi (189.70 km) |
| Castel Gandolfo to Massarosa | 187.77 mi (302.19 km) |
