| Southborough to Miranda de Ebro | 604.65 mi (973.09 km) |
| Southborough to Mislata | 808.01 mi (1,300.37 km) |
| Southborough to Moana | 746.12 mi (1,200.76 km) |
| Southborough to Moguer | 1,020.65 mi (1,642.57 km) |
| Southborough to Molina de Segura | 908.33 mi (1,461.82 km) |
| Southborough to Molins de Rey | 678.49 mi (1,091.93 km) |
| Southborough to Mollerusa | 659.01 mi (1,060.57 km) |
| Southborough to Mollet | 671.35 mi (1,080.43 km) |
| Southborough to Moncada | 674.55 mi (1,085.58 km) |
| Southborough to Moncada | 803.10 mi (1,292.46 km) |
| Southborough to Monforte de Lemos | 700.47 mi (1,127.31 km) |
| Southborough to Monforte del Cid | 884.38 mi (1,423.27 km) |
| Southborough to Mongat | 676.52 mi (1,088.75 km) |
| Southborough to Monovar | 880.70 mi (1,417.35 km) |
| Southborough to Monserrat | 816.54 mi (1,314.09 km) |
