| Clemson to Octeville | 4,075.32 mi (6,558.60 km) |
| Clemson to Oignies | 4,249.18 mi (6,838.39 km) |
| Clemson to Oissel | 4,197.60 mi (6,755.38 km) |
| Clemson to Olivet | 4,268.79 mi (6,869.96 km) |
| Clemson to Ollioules | 4,575.74 mi (7,363.93 km) |
| Clemson to Olonne-sur-Mer | 4,140.47 mi (6,663.45 km) |
| Clemson to Oloron-Sainte-Marie | 4,277.84 mi (6,884.51 km) |
| Clemson to Onet Village | 4,392.81 mi (7,069.54 km) |
| Clemson to Onnaing | 4,276.01 mi (6,881.57 km) |
| Clemson to Orange | 4,499.16 mi (7,240.70 km) |
| Clemson to Orchies | 4,259.32 mi (6,854.71 km) |
| Clemson to Orleans | 4,268.17 mi (6,868.95 km) |
| Clemson to Orly | 4,267.42 mi (6,867.76 km) |
| Clemson to Ormesson-sur-Marne | 4,272.52 mi (6,875.96 km) |
| Clemson to Orsay | 4,259.88 mi (6,855.61 km) |
