| Glenn Dale to Montalegre | 3,535.68 mi (5,690.13 km) |
| Glenn Dale to Montemor-o-Novo | 3,598.48 mi (5,791.19 km) |
| Glenn Dale to Montemor-o-Velho | 3,534.88 mi (5,688.84 km) |
| Glenn Dale to Montijo | 3,563.72 mi (5,735.25 km) |
| Glenn Dale to Mortagua | 3,549.89 mi (5,713.00 km) |
| Glenn Dale to Moura | 3,650.87 mi (5,875.51 km) |
| Glenn Dale to Murtosa | 3,522.68 mi (5,669.20 km) |
| Glenn Dale to Nazare | 3,530.93 mi (5,682.49 km) |
| Glenn Dale to Nelas | 3,566.37 mi (5,739.51 km) |
| Glenn Dale to Obidos | 3,532.84 mi (5,685.56 km) |
| Glenn Dale to Odemira | 3,607.45 mi (5,805.63 km) |
| Glenn Dale to Odivelas | 3,546.95 mi (5,708.27 km) |
| Glenn Dale to Oeiras | 3,543.04 mi (5,701.98 km) |
| Glenn Dale to Olhao | 3,663.01 mi (5,895.05 km) |
| Glenn Dale to Oliveira de Azemeis | 3,527.63 mi (5,677.18 km) |
