| Black Forest to Orbetello | 5,521.88 mi (8,886.61 km) |
| Black Forest to Oria | 5,847.04 mi (9,409.89 km) |
| Black Forest to Oristano | 5,546.26 mi (8,925.84 km) |
| Black Forest to Orta Nova | 5,737.34 mi (9,233.36 km) |
| Black Forest to Orte | 5,563.06 mi (8,952.88 km) |
| Black Forest to Ortona | 5,639.81 mi (9,076.39 km) |
| Black Forest to Orvieto | 5,540.52 mi (8,916.60 km) |
| Black Forest to Orzinuovi | 5,333.60 mi (8,583.60 km) |
| Black Forest to Osimo | 5,551.13 mi (8,933.68 km) |
| Black Forest to Ospitaletto | 5,331.10 mi (8,579.58 km) |
| Black Forest to Ostuni | 5,833.19 mi (9,387.61 km) |
| Black Forest to Ottaviano | 5,718.08 mi (9,202.36 km) |
| Black Forest to Ovada | 5,323.91 mi (8,568.00 km) |
| Black Forest to Ozieri | 5,529.53 mi (8,898.92 km) |
| Black Forest to Paceco | 5,790.72 mi (9,319.27 km) |
