| Triangle to Oerlinghausen | 4,032.32 mi (6,489.39 km) |
| Triangle to Oestrich-Winkel | 4,060.96 mi (6,535.48 km) |
| Triangle to Offenburg | 4,102.47 mi (6,602.28 km) |
| Triangle to Oftersheim | 4,102.84 mi (6,602.89 km) |
| Triangle to Ohrdruf | 4,146.02 mi (6,672.37 km) |
| Triangle to Ohringen | 4,145.18 mi (6,671.01 km) |
| Triangle to Olbernhau | 4,252.84 mi (6,844.28 km) |
| Triangle to Olching | 4,250.10 mi (6,839.87 km) |
| Triangle to Oldenburg | 3,982.89 mi (6,409.84 km) |
| Triangle to Oldenburg in Holstein | 4,051.78 mi (6,520.70 km) |
| Triangle to Olfen | 3,988.81 mi (6,419.37 km) |
| Triangle to Olpe | 4,025.75 mi (6,478.82 km) |
| Triangle to Olsberg | 4,042.26 mi (6,505.39 km) |
| Triangle to Oranienburg | 4,184.43 mi (6,734.20 km) |
| Triangle to Ortenberg | 4,093.25 mi (6,587.45 km) |
