| Ellicott City to Octeville | 3,618.90 mi (5,824.05 km) |
| Ellicott City to Oignies | 3,791.83 mi (6,102.36 km) |
| Ellicott City to Oissel | 3,740.95 mi (6,020.48 km) |
| Ellicott City to Olivet | 3,813.01 mi (6,136.45 km) |
| Ellicott City to Ollioules | 4,123.46 mi (6,636.06 km) |
| Ellicott City to Olonne-sur-Mer | 3,686.96 mi (5,933.58 km) |
| Ellicott City to Oloron-Sainte-Marie | 3,828.60 mi (6,161.53 km) |
| Ellicott City to Onet Village | 3,940.40 mi (6,341.46 km) |
| Ellicott City to Onnaing | 3,818.65 mi (6,145.52 km) |
| Ellicott City to Orange | 4,046.13 mi (6,511.62 km) |
| Ellicott City to Orchies | 3,801.95 mi (6,118.65 km) |
| Ellicott City to Orleans | 3,812.36 mi (6,135.39 km) |
| Ellicott City to Orly | 3,810.94 mi (6,133.12 km) |
| Ellicott City to Ormesson-sur-Marne | 3,815.99 mi (6,141.24 km) |
| Ellicott City to Orsay | 3,803.45 mi (6,121.07 km) |
