| Guaynabo to McKeesport (Pennsylvania) | 1,722.86 mi (2,772.68 km) |
| Guaynabo to McKinleyville (California) | 3,735.84 mi (6,012.25 km) |
| Guaynabo to McKinney (Texas) | 2,147.09 mi (3,455.40 km) |
| Guaynabo to McLean (Virginia) | 1,568.37 mi (2,524.05 km) |
| Guaynabo to McMinnville (Oregon) | 3,734.05 mi (6,009.37 km) |
| Guaynabo to McMinnville (Tennessee) | 1,694.54 mi (2,727.10 km) |
| Guaynabo to McNair (Virginia) | 1,574.40 mi (2,533.75 km) |
| Guaynabo to McPherson (Kansas) | 2,343.71 mi (3,771.84 km) |
| Guaynabo to Mead Valley (California) | 3,312.76 mi (5,331.38 km) |
| Guaynabo to Meadow Woods (Florida) | 1,185.30 mi (1,907.56 km) |
| Guaynabo to Meadowbrook (Virginia) | 1,484.76 mi (2,389.48 km) |
| Guaynabo to Meadville (Pennsylvania) | 1,807.82 mi (2,909.41 km) |
| Guaynabo to Mebane (North Carolina) | 1,462.74 mi (2,354.05 km) |
| Guaynabo to Mechanicsville (Virginia) | 1,493.18 mi (2,403.03 km) |
| Guaynabo to Medford (Massachusetts) | 1,686.69 mi (2,714.46 km) |
