| Alba Iulia to Nuth | 873.71 mi (1,406.09 km) |
| Alba Iulia to Oegstgeest | 957.69 mi (1,541.26 km) |
| Alba Iulia to Oirschot | 909.33 mi (1,463.42 km) |
| Alba Iulia to Oisterwijk | 915.14 mi (1,472.78 km) |
| Alba Iulia to Oldebroek | 907.30 mi (1,460.16 km) |
| Alba Iulia to Oldenzaal | 863.55 mi (1,389.75 km) |
| Alba Iulia to Ommen | 889.01 mi (1,430.72 km) |
| Alba Iulia to Oosterend | 916.02 mi (1,474.19 km) |
| Alba Iulia to Oosterhout | 930.42 mi (1,497.37 km) |
| Alba Iulia to Oosterwolde | 907.13 mi (1,459.89 km) |
| Alba Iulia to Oostzaan | 946.83 mi (1,523.78 km) |
| Alba Iulia to Opmeer | 950.75 mi (1,530.09 km) |
| Alba Iulia to Oss | 906.15 mi (1,458.31 km) |
| Alba Iulia to Oud-Beijerland | 952.64 mi (1,533.12 km) |
| Alba Iulia to Oudenbosch | 943.04 mi (1,517.67 km) |
