| Williamsport to McHenry (Illinois) | 584.38 mi (940.47 km) |
| Williamsport to McKeesport (Pennsylvania) | 159.40 mi (256.53 km) |
| Williamsport to McKinleyville (California) | 2,419.14 mi (3,893.23 km) |
| Williamsport to McKinney (Texas) | 1,210.58 mi (1,948.24 km) |
| Williamsport to McLean (Virginia) | 158.88 mi (255.69 km) |
| Williamsport to McMinnville (Oregon) | 2,307.97 mi (3,714.31 km) |
| Williamsport to McMinnville (Tennessee) | 608.56 mi (979.39 km) |
| Williamsport to McNair (Virginia) | 159.36 mi (256.47 km) |
| Williamsport to McPherson (Kansas) | 1,109.72 mi (1,785.92 km) |
| Williamsport to Mead Valley (California) | 2,242.67 mi (3,609.24 km) |
| Williamsport to Meadow Woods (Florida) | 921.90 mi (1,483.65 km) |
| Williamsport to Meadowbrook (Virginia) | 264.26 mi (425.29 km) |
| Williamsport to Meadville (Pennsylvania) | 163.50 mi (263.13 km) |
| Williamsport to Mebane (North Carolina) | 376.00 mi (605.12 km) |
| Williamsport to Mechanicsville (Virginia) | 250.26 mi (402.75 km) |
