| Forest to Oignies | 62.98 mi (101.35 km) |
| Forest to Oissel | 175.72 mi (282.79 km) |
| Forest to Olivet | 231.12 mi (371.96 km) |
| Forest to Ollioules | 535.00 mi (861.00 km) |
| Forest to Olonne-sur-Mer | 405.59 mi (652.74 km) |
| Forest to Oloron-Sainte-Marie | 575.09 mi (925.52 km) |
| Forest to Onet Village | 452.69 mi (728.53 km) |
| Forest to Onnaing | 43.35 mi (69.76 km) |
| Forest to Orange | 461.74 mi (743.09 km) |
| Forest to Orchies | 52.80 mi (84.97 km) |
| Forest to Orleans | 228.58 mi (367.86 km) |
| Forest to Orly | 166.93 mi (268.64 km) |
| Forest to Ormesson-sur-Marne | 161.13 mi (259.32 km) |
| Forest to Orsay | 174.50 mi (280.83 km) |
| Forest to Orthez | 559.55 mi (900.52 km) |
