| Costa Mesa to Octeville | 5,486.95 mi (8,830.39 km) |
| Costa Mesa to Oignies | 5,600.42 mi (9,013.01 km) |
| Costa Mesa to Oissel | 5,591.85 mi (8,999.21 km) |
| Costa Mesa to Olivet | 5,688.43 mi (9,154.64 km) |
| Costa Mesa to Ollioules | 6,053.80 mi (9,742.65 km) |
| Costa Mesa to Olonne-sur-Mer | 5,621.85 mi (9,047.50 km) |
| Costa Mesa to Oloron-Sainte-Marie | 5,817.52 mi (9,362.39 km) |
| Costa Mesa to Onet Village | 5,879.17 mi (9,461.61 km) |
| Costa Mesa to Onnaing | 5,623.49 mi (9,050.13 km) |
| Costa Mesa to Orange | 5,968.16 mi (9,604.83 km) |
| Costa Mesa to Orchies | 5,608.11 mi (9,025.39 km) |
| Costa Mesa to Orleans | 5,686.88 mi (9,152.15 km) |
| Costa Mesa to Orly | 5,663.14 mi (9,113.94 km) |
| Costa Mesa to Ormesson-sur-Marne | 5,665.95 mi (9,118.46 km) |
| Costa Mesa to Orsay | 5,658.51 mi (9,106.49 km) |
