| Miercurea-Ciuc to Octeville | 1,281.49 mi (2,062.35 km) |
| Miercurea-Ciuc to Oignies | 1,079.04 mi (1,736.55 km) |
| Miercurea-Ciuc to Oissel | 1,158.67 mi (1,864.70 km) |
| Miercurea-Ciuc to Olivet | 1,124.17 mi (1,809.17 km) |
| Miercurea-Ciuc to Ollioules | 1,001.23 mi (1,611.32 km) |
| Miercurea-Ciuc to Olonne-sur-Mer | 1,306.06 mi (2,101.90 km) |
| Miercurea-Ciuc to Oloron-Sainte-Marie | 1,307.26 mi (2,103.84 km) |
| Miercurea-Ciuc to Onet Village | 1,130.93 mi (1,820.05 km) |
| Miercurea-Ciuc to Onnaing | 1,051.97 mi (1,692.98 km) |
| Miercurea-Ciuc to Orange | 1,029.47 mi (1,656.78 km) |
| Miercurea-Ciuc to Orchies | 1,068.14 mi (1,719.01 km) |
| Miercurea-Ciuc to Orleans | 1,123.61 mi (1,808.28 km) |
| Miercurea-Ciuc to Orly | 1,099.51 mi (1,769.50 km) |
| Miercurea-Ciuc to Ormesson-sur-Marne | 1,092.88 mi (1,758.82 km) |
| Miercurea-Ciuc to Orsay | 1,108.89 mi (1,784.59 km) |
