| Covasna to Nuth | 991.32 mi (1,595.37 km) |
| Covasna to Oegstgeest | 1,071.72 mi (1,724.77 km) |
| Covasna to Oirschot | 1,025.26 mi (1,649.99 km) |
| Covasna to Oisterwijk | 1,030.84 mi (1,658.98 km) |
| Covasna to Oldebroek | 1,019.19 mi (1,640.23 km) |
| Covasna to Oldenzaal | 974.99 mi (1,569.10 km) |
| Covasna to Ommen | 1,000.13 mi (1,609.56 km) |
| Covasna to Oosterend | 1,025.46 mi (1,650.32 km) |
| Covasna to Oosterhout | 1,046.12 mi (1,683.57 km) |
| Covasna to Oosterwolde | 1,016.39 mi (1,635.72 km) |
| Covasna to Oostzaan | 1,059.63 mi (1,705.32 km) |
| Covasna to Opmeer | 1,062.48 mi (1,709.89 km) |
| Covasna to Oss | 1,020.98 mi (1,643.11 km) |
| Covasna to Oud-Beijerland | 1,068.01 mi (1,718.79 km) |
| Covasna to Oudenbosch | 1,059.11 mi (1,704.48 km) |
