| Willoughby to Montgomeryville (Pennsylvania) | 335.93 mi (540.62 km) |
| Willoughby to Monticello (Minnesota) | 669.73 mi (1,077.83 km) |
| Willoughby to Montrose (Colorado) | 1,410.24 mi (2,269.56 km) |
| Willoughby to Moody (Alabama) | 621.54 mi (1,000.26 km) |
| Willoughby to Moore (Oklahoma) | 970.27 mi (1,561.49 km) |
| Willoughby to Moorestown-Lenola (New Jersey) | 356.34 mi (573.47 km) |
| Willoughby to Mooresville (North Carolina) | 419.96 mi (675.86 km) |
| Willoughby to Moorhead (Minnesota) | 838.46 mi (1,349.38 km) |
| Willoughby to Moorpark (California) | 2,085.78 mi (3,356.74 km) |
| Willoughby to Moraga (California) | 2,158.66 mi (3,474.03 km) |
| Willoughby to Moreno Valley (California) | 2,010.35 mi (3,235.34 km) |
| Willoughby to Morgan City (Louisiana) | 989.59 mi (1,592.59 km) |
| Willoughby to Morgan Hill (California) | 2,151.19 mi (3,462.01 km) |
| Willoughby to Morganton (North Carolina) | 408.31 mi (657.10 km) |
| Willoughby to Morgantown (West Virginia) | 158.47 mi (255.04 km) |
