| Ontario to Merriam (Kansas) | 1,313.89 mi (2,114.50 km) |
| Ontario to Merrick (New York) | 2,436.53 mi (3,921.22 km) |
| Ontario to Merrifield (Virginia) | 2,249.40 mi (3,620.05 km) |
| Ontario to Merrillville (Indiana) | 1,722.23 mi (2,771.66 km) |
| Ontario to Merritt Island (Florida) | 2,206.81 mi (3,551.52 km) |
| Ontario to Mesa (Arizona) | 341.22 mi (549.14 km) |
| Ontario to Mesquite (Nevada) | 273.30 mi (439.84 km) |
| Ontario to Mesquite (Texas) | 1,213.57 mi (1,953.05 km) |
| Ontario to Metairie (Louisiana) | 1,625.88 mi (2,616.60 km) |
| Ontario to Methuen Town (Massachusetts) | 2,551.04 mi (4,105.49 km) |
| Ontario to Metuchen (New Jersey) | 2,394.61 mi (3,853.75 km) |
| Ontario to Mexico (Missouri) | 1,465.31 mi (2,358.19 km) |
| Ontario to Miami (Florida) | 2,297.47 mi (3,697.43 km) |
| Ontario to Miami (Oklahoma) | 1,291.34 mi (2,078.21 km) |
| Ontario to Miami Beach (Florida) | 2,300.59 mi (3,702.45 km) |
