| Boulder to Montalegre | 4,782.74 mi (7,697.08 km) |
| Boulder to Montemor-o-Novo | 4,893.70 mi (7,875.65 km) |
| Boulder to Montemor-o-Velho | 4,811.83 mi (7,743.90 km) |
| Boulder to Montijo | 4,862.62 mi (7,825.63 km) |
| Boulder to Mortagua | 4,820.28 mi (7,757.48 km) |
| Boulder to Moura | 4,948.33 mi (7,963.56 km) |
| Boulder to Murtosa | 4,791.13 mi (7,710.58 km) |
| Boulder to Nazare | 4,818.22 mi (7,754.18 km) |
| Boulder to Nelas | 4,833.19 mi (7,778.27 km) |
| Boulder to Obidos | 4,824.05 mi (7,763.56 km) |
| Boulder to Odemira | 4,919.31 mi (7,916.86 km) |
| Boulder to Odivelas | 4,846.08 mi (7,799.01 km) |
| Boulder to Oeiras | 4,844.44 mi (7,796.37 km) |
| Boulder to Olhao | 4,977.24 mi (8,010.09 km) |
| Boulder to Oliveira de Azemeis | 4,793.56 mi (7,714.50 km) |
