| Risca to McKeesport (Pennsylvania) | 3,591.93 mi (5,780.65 km) |
| Risca to McKinleyville (California) | 5,127.35 mi (8,251.68 km) |
| Risca to McKinney (Texas) | 4,603.22 mi (7,408.17 km) |
| Risca to McLean (Virginia) | 3,545.97 mi (5,706.68 km) |
| Risca to McMinnville (Oregon) | 4,858.39 mi (7,818.82 km) |
| Risca to McMinnville (Tennessee) | 4,047.07 mi (6,513.13 km) |
| Risca to McNair (Virginia) | 3,554.55 mi (5,720.50 km) |
| Risca to McPherson (Kansas) | 4,380.57 mi (7,049.85 km) |
| Risca to Mead Valley (California) | 5,320.10 mi (8,561.87 km) |
| Risca to Meadow Woods (Florida) | 4,219.95 mi (6,791.35 km) |
| Risca to Meadowbrook (Virginia) | 3,625.52 mi (5,834.70 km) |
| Risca to Meadville (Pennsylvania) | 3,546.67 mi (5,707.82 km) |
| Risca to Mebane (North Carolina) | 3,761.70 mi (6,053.87 km) |
| Risca to Mechanicsville (Virginia) | 3,611.75 mi (5,812.55 km) |
| Risca to Medford (Massachusetts) | 3,146.88 mi (5,064.42 km) |
