| Forest Lake to Orbetello | 4,794.05 mi (7,715.27 km) |
| Forest Lake to Oria | 5,123.80 mi (8,245.97 km) |
| Forest Lake to Oristano | 4,813.38 mi (7,746.38 km) |
| Forest Lake to Orta Nova | 5,012.93 mi (8,067.53 km) |
| Forest Lake to Orte | 4,836.48 mi (7,783.57 km) |
| Forest Lake to Ortona | 4,915.39 mi (7,910.56 km) |
| Forest Lake to Orvieto | 4,814.03 mi (7,747.43 km) |
| Forest Lake to Orzinuovi | 4,609.06 mi (7,417.56 km) |
| Forest Lake to Osimo | 4,827.47 mi (7,769.07 km) |
| Forest Lake to Ospitaletto | 4,606.99 mi (7,414.23 km) |
| Forest Lake to Ostuni | 5,110.27 mi (8,224.18 km) |
| Forest Lake to Ottaviano | 4,991.46 mi (8,032.98 km) |
| Forest Lake to Ovada | 4,596.75 mi (7,397.76 km) |
| Forest Lake to Ozieri | 4,797.56 mi (7,720.93 km) |
| Forest Lake to Paceco | 5,058.83 mi (8,141.40 km) |
