| Odorheiu Secuiesc to Nuth | 938.94 mi (1,511.07 km) |
| Odorheiu Secuiesc to Oegstgeest | 1,018.84 mi (1,639.66 km) |
| Odorheiu Secuiesc to Oirschot | 972.60 mi (1,565.25 km) |
| Odorheiu Secuiesc to Oisterwijk | 978.15 mi (1,574.18 km) |
| Odorheiu Secuiesc to Oldebroek | 966.16 mi (1,554.88 km) |
| Odorheiu Secuiesc to Oldenzaal | 921.94 mi (1,483.72 km) |
| Odorheiu Secuiesc to Ommen | 947.06 mi (1,524.15 km) |
| Odorheiu Secuiesc to Oosterend | 972.33 mi (1,564.82 km) |
| Odorheiu Secuiesc to Oosterhout | 993.43 mi (1,598.77 km) |
| Odorheiu Secuiesc to Oosterwolde | 963.26 mi (1,550.22 km) |
| Odorheiu Secuiesc to Oostzaan | 1,006.65 mi (1,620.05 km) |
| Odorheiu Secuiesc to Opmeer | 1,009.43 mi (1,624.52 km) |
| Odorheiu Secuiesc to Oss | 968.19 mi (1,558.14 km) |
| Odorheiu Secuiesc to Oud-Beijerland | 1,015.27 mi (1,633.92 km) |
| Odorheiu Secuiesc to Oudenbosch | 1,006.47 mi (1,619.76 km) |
