| Ottawa to Mattoon (Illinois) | 132.04 mi (212.49 km) |
| Ottawa to Mauldin (South Carolina) | 575.96 mi (926.91 km) |
| Ottawa to Maumee (Ohio) | 267.67 mi (430.78 km) |
| Ottawa to Maumelle (Arkansas) | 489.43 mi (787.65 km) |
| Ottawa to Mayagüez (Puerto Rico) | 2,049.35 mi (3,298.11 km) |
| Ottawa to Mayfield Heights (Ohio) | 381.94 mi (614.68 km) |
| Ottawa to Mays Chapel (Maryland) | 653.65 mi (1,051.95 km) |
| Ottawa to Maywood (California) | 1,675.18 mi (2,695.95 km) |
| Ottawa to Maywood (Illinois) | 62.33 mi (100.30 km) |
| Ottawa to McAlester (Oklahoma) | 582.58 mi (937.57 km) |
| Ottawa to McAllen (Texas) | 1,175.28 mi (1,891.43 km) |
| Ottawa to McCalla (Alabama) | 565.06 mi (909.38 km) |
| Ottawa to McComb (Mississippi) | 704.57 mi (1,133.89 km) |
| Ottawa to McDonough (Georgia) | 603.90 mi (971.88 km) |
| Ottawa to McFarland (California) | 1,681.09 mi (2,705.46 km) |
