| Odorheiu Secuiesc to Octeville | 1,260.20 mi (2,028.09 km) |
| Odorheiu Secuiesc to Oignies | 1,058.47 mi (1,703.45 km) |
| Odorheiu Secuiesc to Oissel | 1,137.21 mi (1,830.16 km) |
| Odorheiu Secuiesc to Olivet | 1,101.79 mi (1,773.17 km) |
| Odorheiu Secuiesc to Ollioules | 977.18 mi (1,572.62 km) |
| Odorheiu Secuiesc to Olonne-sur-Mer | 1,283.19 mi (2,065.10 km) |
| Odorheiu Secuiesc to Oloron-Sainte-Marie | 1,283.40 mi (2,065.44 km) |
| Odorheiu Secuiesc to Onet Village | 1,107.16 mi (1,781.80 km) |
| Odorheiu Secuiesc to Onnaing | 1,031.37 mi (1,659.83 km) |
| Odorheiu Secuiesc to Orange | 1,005.57 mi (1,618.31 km) |
| Odorheiu Secuiesc to Orchies | 1,047.59 mi (1,685.93 km) |
| Odorheiu Secuiesc to Orleans | 1,101.26 mi (1,772.31 km) |
| Odorheiu Secuiesc to Orly | 1,077.66 mi (1,734.33 km) |
| Odorheiu Secuiesc to Ormesson-sur-Marne | 1,071.06 mi (1,723.71 km) |
| Odorheiu Secuiesc to Orsay | 1,087.01 mi (1,749.38 km) |
