| Penarth to Monticello (Minnesota) | 3,908.65 mi (6,290.37 km) |
| Penarth to Montrose (Colorado) | 4,749.48 mi (7,643.55 km) |
| Penarth to Moody (Alabama) | 4,177.51 mi (6,723.05 km) |
| Penarth to Moore (Oklahoma) | 4,528.91 mi (7,288.58 km) |
| Penarth to Moorestown-Lenola (New Jersey) | 3,409.44 mi (5,486.96 km) |
| Penarth to Mooresville (North Carolina) | 3,849.33 mi (6,194.90 km) |
| Penarth to Moorhead (Minnesota) | 3,941.42 mi (6,343.10 km) |
| Penarth to Moorpark (California) | 5,352.51 mi (8,614.03 km) |
| Penarth to Moraga (California) | 5,253.48 mi (8,454.66 km) |
| Penarth to Moreno Valley (California) | 5,317.38 mi (8,557.49 km) |
| Penarth to Morgan City (Louisiana) | 4,562.86 mi (7,343.21 km) |
| Penarth to Morgan Hill (California) | 5,279.27 mi (8,496.16 km) |
| Penarth to Morganton (North Carolina) | 3,878.16 mi (6,241.29 km) |
| Penarth to Morgantown (West Virginia) | 3,628.20 mi (5,839.03 km) |
| Penarth to Morris (Illinois) | 3,887.09 mi (6,255.67 km) |
