| Antrim to Oberkirch | 744.91 mi (1,198.82 km) |
| Antrim to Obernburg am Main | 728.93 mi (1,173.10 km) |
| Antrim to Obernkirchen | 650.77 mi (1,047.32 km) |
| Antrim to Oberschleissheim | 882.03 mi (1,419.50 km) |
| Antrim to Oberstdorf | 872.51 mi (1,404.17 km) |
| Antrim to Obertraubling | 875.64 mi (1,409.21 km) |
| Antrim to Obertshausen | 708.91 mi (1,140.88 km) |
| Antrim to Oberursel | 694.26 mi (1,117.30 km) |
| Antrim to Ochsenfurt | 770.67 mi (1,240.27 km) |
| Antrim to Ochsenhausen | 831.09 mi (1,337.50 km) |
| Antrim to Ochtrup | 576.68 mi (928.08 km) |
| Antrim to Odenthal | 609.82 mi (981.42 km) |
| Antrim to Oelde | 624.36 mi (1,004.81 km) |
| Antrim to Oelsnitz | 823.83 mi (1,325.83 km) |
| Antrim to Oer-Erkenschwick | 595.17 mi (957.83 km) |
