| Antrim to Oerlinghausen | 640.84 mi (1,031.33 km) |
| Antrim to Oestrich-Winkel | 680.56 mi (1,095.25 km) |
| Antrim to Offenburg | 742.69 mi (1,195.25 km) |
| Antrim to Oftersheim | 726.95 mi (1,169.91 km) |
| Antrim to Ohrdruf | 754.98 mi (1,215.02 km) |
| Antrim to Ohringen | 767.27 mi (1,234.80 km) |
| Antrim to Olbernhau | 861.40 mi (1,386.29 km) |
| Antrim to Olching | 874.97 mi (1,408.13 km) |
| Antrim to Oldenburg | 595.45 mi (958.28 km) |
| Antrim to Oldenburg in Holstein | 684.41 mi (1,101.46 km) |
| Antrim to Olfen | 598.03 mi (962.43 km) |
| Antrim to Olpe | 637.50 mi (1,025.96 km) |
| Antrim to Olsberg | 651.63 mi (1,048.70 km) |
| Antrim to Oranienburg | 803.39 mi (1,292.92 km) |
| Antrim to Ortenberg | 706.69 mi (1,137.30 km) |
