| Rio Grande City to Octeville | 5,152.54 mi (8,292.22 km) |
| Rio Grande City to Oignies | 5,316.10 mi (8,555.44 km) |
| Rio Grande City to Oissel | 5,272.81 mi (8,485.77 km) |
| Rio Grande City to Olivet | 5,349.70 mi (8,609.51 km) |
| Rio Grande City to Ollioules | 5,669.17 mi (9,123.65 km) |
| Rio Grande City to Olonne-sur-Mer | 5,230.85 mi (8,418.25 km) |
| Rio Grande City to Oloron-Sainte-Marie | 5,377.52 mi (8,654.29 km) |
| Rio Grande City to Onet Village | 5,486.05 mi (8,828.95 km) |
| Rio Grande City to Onnaing | 5,342.48 mi (8,597.89 km) |
| Rio Grande City to Orange | 5,590.63 mi (8,997.25 km) |
| Rio Grande City to Orchies | 5,325.85 mi (8,571.13 km) |
| Rio Grande City to Orleans | 5,348.90 mi (8,608.22 km) |
| Rio Grande City to Orly | 5,343.74 mi (8,599.93 km) |
| Rio Grande City to Ormesson-sur-Marne | 5,348.45 mi (8,607.50 km) |
| Rio Grande City to Orsay | 5,336.68 mi (8,588.56 km) |
