| Gretna to Piedras Blancas | 4,552.71 mi (7,326.88 km) |
| Gretna to Piera | 4,969.96 mi (7,998.38 km) |
| Gretna to Pilar de la Horadada | 4,950.54 mi (7,967.13 km) |
| Gretna to Pilas | 4,687.21 mi (7,543.34 km) |
| Gretna to Pinos Puente | 4,818.35 mi (7,754.39 km) |
| Gretna to Pinto | 4,742.32 mi (7,632.03 km) |
| Gretna to Pizarra | 4,782.81 mi (7,697.19 km) |
| Gretna to Plasencia | 4,630.09 mi (7,451.41 km) |
| Gretna to Pola de Laviana | 4,580.01 mi (7,370.82 km) |
| Gretna to Pola de Lena | 4,568.84 mi (7,352.84 km) |
| Gretna to Pola de Siero | 4,572.17 mi (7,358.20 km) |
| Gretna to Pollensa | 5,078.01 mi (8,172.27 km) |
| Gretna to Ponferrada | 4,546.44 mi (7,316.79 km) |
| Gretna to Pontevedra | 4,450.36 mi (7,162.16 km) |
| Gretna to Portugalete | 4,697.72 mi (7,560.26 km) |
