| Owings Mills to Nyon | 4,033.29 mi (6,490.96 km) |
| Owings Mills to Oberriet | 4,145.67 mi (6,671.81 km) |
| Owings Mills to Obersiggenthal | 4,087.13 mi (6,577.60 km) |
| Owings Mills to Oberwil | 4,055.40 mi (6,526.54 km) |
| Owings Mills to Oberwingert | 4,106.14 mi (6,608.20 km) |
| Owings Mills to Oftringen | 4,076.58 mi (6,560.62 km) |
| Owings Mills to Olten | 4,074.86 mi (6,557.86 km) |
| Owings Mills to Onex | 4,033.57 mi (6,491.40 km) |
| Owings Mills to Opfikon | 4,100.27 mi (6,598.75 km) |
| Owings Mills to Ostermundigen | 4,069.57 mi (6,549.33 km) |
| Owings Mills to Payerne | 4,050.16 mi (6,518.10 km) |
| Owings Mills to Pfaffikon | 4,111.39 mi (6,616.64 km) |
| Owings Mills to Plan-les-Ouates | 4,034.79 mi (6,493.36 km) |
| Owings Mills to Pratteln | 4,061.41 mi (6,536.21 km) |
| Owings Mills to Prilly | 4,044.49 mi (6,508.98 km) |
