| Castel Gandolfo to McKeesport (Pennsylvania) | 4,562.20 mi (7,342.15 km) |
| Castel Gandolfo to McKinleyville (California) | 6,115.41 mi (9,841.79 km) |
| Castel Gandolfo to McKinney (Texas) | 5,589.99 mi (8,996.21 km) |
| Castel Gandolfo to McLean (Virginia) | 4,502.16 mi (7,245.53 km) |
| Castel Gandolfo to McMinnville (Oregon) | 5,839.96 mi (9,398.51 km) |
| Castel Gandolfo to McMinnville (Tennessee) | 5,014.08 mi (8,069.38 km) |
| Castel Gandolfo to McNair (Virginia) | 4,511.45 mi (7,260.48 km) |
| Castel Gandolfo to McPherson (Kansas) | 5,379.73 mi (8,657.84 km) |
| Castel Gandolfo to Mead Valley (California) | 6,325.77 mi (10,180.35 km) |
| Castel Gandolfo to Meadow Woods (Florida) | 5,133.62 mi (8,261.76 km) |
| Castel Gandolfo to Meadowbrook (Virginia) | 4,574.64 mi (7,362.17 km) |
| Castel Gandolfo to Meadville (Pennsylvania) | 4,523.14 mi (7,279.29 km) |
| Castel Gandolfo to Mebane (North Carolina) | 4,709.84 mi (7,579.75 km) |
| Castel Gandolfo to Mechanicsville (Virginia) | 4,561.53 mi (7,341.08 km) |
| Castel Gandolfo to Medford (Massachusetts) | 4,104.17 mi (6,605.02 km) |
