| DeForest to Octeville | 3,956.65 mi (6,367.61 km) |
| DeForest to Oignies | 4,102.65 mi (6,602.57 km) |
| DeForest to Oissel | 4,072.08 mi (6,553.38 km) |
| DeForest to Olivet | 4,157.92 mi (6,691.52 km) |
| DeForest to Ollioules | 4,501.42 mi (7,244.34 km) |
| DeForest to Olonne-sur-Mer | 4,061.07 mi (6,535.66 km) |
| DeForest to Oloron-Sainte-Marie | 4,234.04 mi (6,814.02 km) |
| DeForest to Onet Village | 4,320.23 mi (6,952.74 km) |
| DeForest to Onnaing | 4,128.12 mi (6,643.57 km) |
| DeForest to Orange | 4,418.70 mi (7,111.21 km) |
| DeForest to Orchies | 4,111.76 mi (6,617.24 km) |
| DeForest to Orleans | 4,156.80 mi (6,689.72 km) |
| DeForest to Orly | 4,143.97 mi (6,669.08 km) |
| DeForest to Ormesson-sur-Marne | 4,147.98 mi (6,675.53 km) |
| DeForest to Orsay | 4,137.81 mi (6,659.16 km) |
