| Guarda to Octeville | 686.41 mi (1,104.67 km) |
| Guarda to Oignies | 847.62 mi (1,364.12 km) |
| Guarda to Oissel | 733.97 mi (1,181.21 km) |
| Guarda to Olivet | 681.50 mi (1,096.76 km) |
| Guarda to Ollioules | 701.14 mi (1,128.38 km) |
| Guarda to Olonne-sur-Mer | 499.30 mi (803.55 km) |
| Guarda to Oloron-Sainte-Marie | 391.75 mi (630.46 km) |
| Guarda to Onet Village | 570.63 mi (918.34 km) |
| Guarda to Onnaing | 860.80 mi (1,385.32 km) |
| Guarda to Orange | 667.52 mi (1,074.28 km) |
| Guarda to Orchies | 855.03 mi (1,376.04 km) |
| Guarda to Orleans | 683.65 mi (1,100.22 km) |
| Guarda to Orly | 740.72 mi (1,192.07 km) |
| Guarda to Ormesson-sur-Marne | 747.39 mi (1,202.82 km) |
| Guarda to Orsay | 731.99 mi (1,178.02 km) |
