| Cortland to Oerlinghausen | 3,798.59 mi (6,113.24 km) |
| Cortland to Oestrich-Winkel | 3,834.16 mi (6,170.49 km) |
| Cortland to Offenburg | 3,880.81 mi (6,245.56 km) |
| Cortland to Oftersheim | 3,877.50 mi (6,240.23 km) |
| Cortland to Ohrdruf | 3,913.87 mi (6,298.76 km) |
| Cortland to Ohringen | 3,919.41 mi (6,307.67 km) |
| Cortland to Olbernhau | 4,018.58 mi (6,467.28 km) |
| Cortland to Olching | 4,025.49 mi (6,478.40 km) |
| Cortland to Oldenburg | 3,745.89 mi (6,028.43 km) |
| Cortland to Oldenburg in Holstein | 3,809.18 mi (6,130.28 km) |
| Cortland to Olfen | 3,757.03 mi (6,046.36 km) |
| Cortland to Olpe | 3,795.81 mi (6,108.77 km) |
| Cortland to Olsberg | 3,810.64 mi (6,132.64 km) |
| Cortland to Oranienburg | 3,944.27 mi (6,347.70 km) |
| Cortland to Ortenberg | 3,864.24 mi (6,218.90 km) |
