| Warren to Oerlinghausen | 4,059.87 mi (6,533.72 km) |
| Warren to Oestrich-Winkel | 4,104.46 mi (6,605.49 km) |
| Warren to Offenburg | 4,157.16 mi (6,690.30 km) |
| Warren to Oftersheim | 4,149.43 mi (6,677.86 km) |
| Warren to Ohrdruf | 4,176.85 mi (6,721.99 km) |
| Warren to Ohringen | 4,190.65 mi (6,744.21 km) |
| Warren to Olbernhau | 4,278.23 mi (6,885.14 km) |
| Warren to Olching | 4,297.77 mi (6,916.59 km) |
| Warren to Oldenburg | 4,002.72 mi (6,441.76 km) |
| Warren to Oldenburg in Holstein | 4,057.14 mi (6,529.34 km) |
| Warren to Olfen | 4,021.16 mi (6,471.43 km) |
| Warren to Olpe | 4,062.23 mi (6,537.53 km) |
| Warren to Olsberg | 4,074.76 mi (6,557.70 km) |
| Warren to Oranienburg | 4,195.50 mi (6,752.01 km) |
| Warren to Ortenberg | 4,131.60 mi (6,649.16 km) |
