| Glen Burnie to Octeville | 3,614.41 mi (5,816.83 km) |
| Glen Burnie to Oignies | 3,787.90 mi (6,096.04 km) |
| Glen Burnie to Oissel | 3,736.57 mi (6,013.43 km) |
| Glen Burnie to Olivet | 3,808.27 mi (6,128.82 km) |
| Glen Burnie to Ollioules | 4,117.82 mi (6,626.99 km) |
| Glen Burnie to Olonne-sur-Mer | 3,681.57 mi (5,924.92 km) |
| Glen Burnie to Oloron-Sainte-Marie | 3,822.40 mi (6,151.57 km) |
| Glen Burnie to Onet Village | 3,934.78 mi (6,332.42 km) |
| Glen Burnie to Onnaing | 3,814.74 mi (6,139.22 km) |
| Glen Burnie to Orange | 4,040.65 mi (6,502.80 km) |
| Glen Burnie to Orchies | 3,798.04 mi (6,112.36 km) |
| Glen Burnie to Orleans | 3,807.63 mi (6,127.79 km) |
| Glen Burnie to Orly | 3,806.48 mi (6,125.94 km) |
| Glen Burnie to Ormesson-sur-Marne | 3,811.55 mi (6,134.10 km) |
| Glen Burnie to Orsay | 3,798.97 mi (6,113.85 km) |
