| Rocky River to Octeville | 3,734.63 mi (6,010.31 km) |
| Rocky River to Oignies | 3,895.83 mi (6,269.73 km) |
| Rocky River to Oissel | 3,854.15 mi (6,202.65 km) |
| Rocky River to Olivet | 3,932.93 mi (6,329.44 km) |
| Rocky River to Ollioules | 4,260.01 mi (6,855.83 km) |
| Rocky River to Olonne-sur-Mer | 3,820.03 mi (6,147.75 km) |
| Rocky River to Oloron-Sainte-Marie | 3,977.00 mi (6,400.36 km) |
| Rocky River to Onet Village | 4,077.15 mi (6,561.55 km) |
| Rocky River to Onnaing | 3,922.14 mi (6,312.08 km) |
| Rocky River to Orange | 4,179.88 mi (6,726.87 km) |
| Rocky River to Orchies | 3,905.53 mi (6,285.34 km) |
| Rocky River to Orleans | 3,932.06 mi (6,328.03 km) |
| Rocky River to Orly | 3,925.32 mi (6,317.20 km) |
| Rocky River to Ormesson-sur-Marne | 3,929.91 mi (6,324.58 km) |
| Rocky River to Orsay | 3,918.42 mi (6,306.09 km) |
