| Waltham to McHenry (Illinois) | 869.02 mi (1,398.55 km) |
| Waltham to McKeesport (Pennsylvania) | 467.68 mi (752.66 km) |
| Waltham to McKinleyville (California) | 2,684.39 mi (4,320.11 km) |
| Waltham to McKinney (Texas) | 1,518.64 mi (2,444.01 km) |
| Waltham to McLean (Virginia) | 392.22 mi (631.22 km) |
| Waltham to McMinnville (Oregon) | 2,552.97 mi (4,108.61 km) |
| Waltham to McMinnville (Tennessee) | 905.48 mi (1,457.23 km) |
| Waltham to McNair (Virginia) | 400.99 mi (645.33 km) |
| Waltham to McPherson (Kansas) | 1,411.88 mi (2,272.20 km) |
| Waltham to Mead Valley (California) | 2,539.47 mi (4,086.88 km) |
| Waltham to Meadow Woods (Florida) | 1,121.56 mi (1,804.97 km) |
| Waltham to Meadowbrook (Virginia) | 475.62 mi (765.43 km) |
| Waltham to Meadville (Pennsylvania) | 459.73 mi (739.86 km) |
| Waltham to Mebane (North Carolina) | 611.34 mi (983.86 km) |
| Waltham to Mechanicsville (Virginia) | 461.24 mi (742.30 km) |
