| Penafiel to McKeesport (Pennsylvania) | 3,632.02 mi (5,845.17 km) |
| Penafiel to McKinleyville (California) | 5,484.14 mi (8,825.88 km) |
| Penafiel to McKinney (Texas) | 4,681.72 mi (7,534.50 km) |
| Penafiel to McLean (Virginia) | 3,547.62 mi (5,709.34 km) |
| Penafiel to McMinnville (Oregon) | 5,241.36 mi (8,435.15 km) |
| Penafiel to McMinnville (Tennessee) | 4,069.38 mi (6,549.03 km) |
| Penafiel to McNair (Virginia) | 3,557.87 mi (5,725.84 km) |
| Penafiel to McPherson (Kansas) | 4,522.74 mi (7,278.65 km) |
| Penafiel to Mead Valley (California) | 5,568.97 mi (8,962.39 km) |
| Penafiel to Meadow Woods (Florida) | 4,118.69 mi (6,628.39 km) |
| Penafiel to Meadowbrook (Virginia) | 3,607.98 mi (5,806.48 km) |
| Penafiel to Meadville (Pennsylvania) | 3,607.27 mi (5,805.34 km) |
| Penafiel to Mebane (North Carolina) | 3,739.49 mi (6,018.13 km) |
| Penafiel to Mechanicsville (Virginia) | 3,596.06 mi (5,787.30 km) |
| Penafiel to Medford (Massachusetts) | 3,159.58 mi (5,084.84 km) |
