| Ottawa to McHenry (Illinois) | 73.26 mi (117.90 km) |
| Ottawa to McKeesport (Pennsylvania) | 474.42 mi (763.51 km) |
| Ottawa to McKinleyville (California) | 1,821.80 mi (2,931.90 km) |
| Ottawa to McKinney (Texas) | 708.70 mi (1,140.54 km) |
| Ottawa to McLean (Virginia) | 635.94 mi (1,023.45 km) |
| Ottawa to McMinnville (Oregon) | 1,735.51 mi (2,793.03 km) |
| Ottawa to McMinnville (Tennessee) | 424.80 mi (683.64 km) |
| Ottawa to McNair (Virginia) | 624.73 mi (1,005.41 km) |
| Ottawa to McPherson (Kansas) | 511.56 mi (823.28 km) |
| Ottawa to Mead Valley (California) | 1,633.72 mi (2,629.22 km) |
| Ottawa to Meadow Woods (Florida) | 991.38 mi (1,595.47 km) |
| Ottawa to Meadowbrook (Virginia) | 663.38 mi (1,067.60 km) |
| Ottawa to Meadville (Pennsylvania) | 449.39 mi (723.22 km) |
| Ottawa to Mebane (North Carolina) | 630.07 mi (1,013.99 km) |
| Ottawa to Mechanicsville (Virginia) | 662.97 mi (1,066.95 km) |
