| Rock Island to Montalegre | 4,092.06 mi (6,585.54 km) |
| Rock Island to Montemor-o-Novo | 4,185.07 mi (6,735.22 km) |
| Rock Island to Montemor-o-Velho | 4,109.71 mi (6,613.94 km) |
| Rock Island to Montijo | 4,152.39 mi (6,682.63 km) |
| Rock Island to Mortagua | 4,120.75 mi (6,631.71 km) |
| Rock Island to Moura | 4,239.17 mi (6,822.28 km) |
| Rock Island to Murtosa | 4,092.15 mi (6,585.68 km) |
| Rock Island to Nazare | 4,112.16 mi (6,617.88 km) |
| Rock Island to Nelas | 4,135.14 mi (6,654.86 km) |
| Rock Island to Obidos | 4,116.52 mi (6,624.90 km) |
| Rock Island to Odemira | 4,204.49 mi (6,766.48 km) |
| Rock Island to Odivelas | 4,135.67 mi (6,655.72 km) |
| Rock Island to Oeiras | 4,133.16 mi (6,651.67 km) |
| Rock Island to Olhao | 4,261.84 mi (6,858.77 km) |
| Rock Island to Oliveira de Azemeis | 4,095.58 mi (6,591.21 km) |
