| Ontario to Marrero (Louisiana) | 1,631.87 mi (2,626.25 km) |
| Ontario to Marshall (Minnesota) | 1,364.63 mi (2,196.16 km) |
| Ontario to Marshall (Missouri) | 1,394.12 mi (2,243.63 km) |
| Ontario to Marshall (Texas) | 1,344.24 mi (2,163.34 km) |
| Ontario to Marshalltown (Iowa) | 1,446.64 mi (2,328.14 km) |
| Ontario to Marshfield (Wisconsin) | 1,628.44 mi (2,620.73 km) |
| Ontario to Martha Lake (Washington) | 983.68 mi (1,583.08 km) |
| Ontario to Martin (Tennessee) | 1,625.47 mi (2,615.94 km) |
| Ontario to Martinez (California) | 371.85 mi (598.43 km) |
| Ontario to Martinez (Georgia) | 2,029.13 mi (3,265.57 km) |
| Ontario to Martinsburg (West Virginia) | 2,207.60 mi (3,552.78 km) |
| Ontario to Martinsville (Indiana) | 1,756.65 mi (2,827.06 km) |
| Ontario to Martinsville (New Jersey) | 2,383.25 mi (3,835.47 km) |
| Ontario to Martinsville (Virginia) | 2,120.86 mi (3,413.20 km) |
| Ontario to Maryland City (Maryland) | 2,271.69 mi (3,655.93 km) |
