| Ballincollig to Oberkirch | 770.79 mi (1,240.47 km) |
| Ballincollig to Obernburg am Main | 784.01 mi (1,261.74 km) |
| Ballincollig to Obernkirchen | 750.51 mi (1,207.83 km) |
| Ballincollig to Oberschleissheim | 925.17 mi (1,488.92 km) |
| Ballincollig to Oberstdorf | 895.89 mi (1,441.80 km) |
| Ballincollig to Obertraubling | 932.23 mi (1,500.28 km) |
| Ballincollig to Obertshausen | 766.39 mi (1,233.39 km) |
| Ballincollig to Oberursel | 752.89 mi (1,211.67 km) |
| Ballincollig to Ochsenfurt | 827.35 mi (1,331.50 km) |
| Ballincollig to Ochsenhausen | 862.02 mi (1,387.29 km) |
| Ballincollig to Ochtrup | 669.57 mi (1,077.56 km) |
| Ballincollig to Odenthal | 677.37 mi (1,090.12 km) |
| Ballincollig to Oelde | 712.71 mi (1,146.99 km) |
| Ballincollig to Oelsnitz | 902.15 mi (1,451.88 km) |
| Ballincollig to Oer-Erkenschwick | 676.21 mi (1,088.26 km) |
