| Potomac to Lagoa | 3,648.19 mi (5,871.20 km) |
| Potomac to Lagoa | 2,758.38 mi (4,439.18 km) |
| Potomac to Lagos | 3,637.91 mi (5,854.65 km) |
| Potomac to Lamego | 3,571.07 mi (5,747.09 km) |
| Potomac to Leiria | 3,558.37 mi (5,726.65 km) |
| Potomac to Lisbon | 3,568.71 mi (5,743.28 km) |
| Potomac to Loule | 3,670.23 mi (5,906.67 km) |
| Potomac to Loures | 3,564.94 mi (5,737.22 km) |
| Potomac to Lourinha | 3,547.57 mi (5,709.26 km) |
| Potomac to Lousa | 3,575.80 mi (5,754.70 km) |
| Potomac to Lousada | 3,545.20 mi (5,705.45 km) |
| Potomac to Macedo de Cavaleiros | 3,600.53 mi (5,794.50 km) |
| Potomac to Mafamude | 3,532.36 mi (5,684.79 km) |
| Potomac to Mafra | 3,553.85 mi (5,719.37 km) |
| Potomac to Maia | 3,528.72 mi (5,678.92 km) |
