| Ontario to Montgomeryville (Pennsylvania) | 2,349.66 mi (3,781.41 km) |
| Ontario to Monticello (Minnesota) | 1,477.51 mi (2,377.83 km) |
| Ontario to Montrose (Colorado) | 622.89 mi (1,002.44 km) |
| Ontario to Moody (Alabama) | 1,779.13 mi (2,863.23 km) |
| Ontario to Moore (Oklahoma) | 1,145.23 mi (1,843.07 km) |
| Ontario to Moorestown-Lenola (New Jersey) | 2,365.43 mi (3,806.80 km) |
| Ontario to Mooresville (North Carolina) | 2,077.04 mi (3,342.67 km) |
| Ontario to Moorhead (Minnesota) | 1,402.41 mi (2,256.96 km) |
| Ontario to Moorpark (California) | 74.60 mi (120.06 km) |
| Ontario to Moraga (California) | 364.49 mi (586.58 km) |
| Ontario to Moreno Valley (California) | 24.36 mi (39.20 km) |
| Ontario to Morgan City (Louisiana) | 1,573.98 mi (2,533.07 km) |
| Ontario to Morgan Hill (California) | 311.54 mi (501.37 km) |
| Ontario to Morganton (North Carolina) | 2,027.00 mi (3,262.14 km) |
| Ontario to Morgantown (West Virginia) | 2,102.31 mi (3,383.35 km) |
