| Owings Mills to Octeville | 3,611.40 mi (5,811.99 km) |
| Owings Mills to Oignies | 3,784.11 mi (6,089.94 km) |
| Owings Mills to Oissel | 3,733.42 mi (6,008.35 km) |
| Owings Mills to Olivet | 3,805.62 mi (6,124.56 km) |
| Owings Mills to Ollioules | 4,116.48 mi (6,624.83 km) |
| Owings Mills to Olonne-sur-Mer | 3,679.86 mi (5,922.16 km) |
| Owings Mills to Oloron-Sainte-Marie | 3,821.89 mi (6,150.74 km) |
| Owings Mills to Onet Village | 3,933.41 mi (6,330.21 km) |
| Owings Mills to Onnaing | 3,810.92 mi (6,133.08 km) |
| Owings Mills to Orange | 4,039.08 mi (6,500.27 km) |
| Owings Mills to Orchies | 3,794.23 mi (6,106.22 km) |
| Owings Mills to Orleans | 3,804.96 mi (6,123.50 km) |
| Owings Mills to Orly | 3,803.43 mi (6,121.04 km) |
| Owings Mills to Ormesson-sur-Marne | 3,808.47 mi (6,129.14 km) |
| Owings Mills to Orsay | 3,795.96 mi (6,109.01 km) |
