| Towson to Octeville | 3,604.84 mi (5,801.43 km) |
| Towson to Oignies | 3,777.81 mi (6,079.80 km) |
| Towson to Oissel | 3,726.90 mi (5,997.87 km) |
| Towson to Olivet | 3,798.95 mi (6,113.81 km) |
| Towson to Ollioules | 4,109.40 mi (6,613.43 km) |
| Towson to Olonne-sur-Mer | 3,672.89 mi (5,910.94 km) |
| Towson to Oloron-Sainte-Marie | 3,814.57 mi (6,138.96 km) |
| Towson to Onet Village | 3,926.34 mi (6,318.83 km) |
| Towson to Onnaing | 3,804.63 mi (6,122.96 km) |
| Towson to Orange | 4,032.07 mi (6,488.98 km) |
| Towson to Orchies | 3,787.94 mi (6,096.09 km) |
| Towson to Orleans | 3,798.29 mi (6,112.76 km) |
| Towson to Orly | 3,796.89 mi (6,110.50 km) |
| Towson to Ormesson-sur-Marne | 3,801.94 mi (6,118.62 km) |
| Towson to Orsay | 3,789.40 mi (6,098.45 km) |
