| Troy to Oerlinghausen | 4,059.99 mi (6,533.92 km) |
| Troy to Oestrich-Winkel | 4,104.91 mi (6,606.22 km) |
| Troy to Offenburg | 4,157.84 mi (6,691.40 km) |
| Troy to Oftersheim | 4,149.94 mi (6,678.68 km) |
| Troy to Ohrdruf | 4,177.02 mi (6,722.27 km) |
| Troy to Ohringen | 4,191.14 mi (6,744.98 km) |
| Troy to Olbernhau | 4,278.27 mi (6,885.21 km) |
| Troy to Olching | 4,298.28 mi (6,917.42 km) |
| Troy to Oldenburg | 4,002.69 mi (6,441.70 km) |
| Troy to Oldenburg in Holstein | 4,056.79 mi (6,528.78 km) |
| Troy to Olfen | 4,021.39 mi (6,471.80 km) |
| Troy to Olpe | 4,062.54 mi (6,538.03 km) |
| Troy to Olsberg | 4,074.99 mi (6,558.06 km) |
| Troy to Oranienburg | 4,195.25 mi (6,751.61 km) |
| Troy to Ortenberg | 4,131.94 mi (6,649.71 km) |
