| Spencer to Octeville | 4,181.78 mi (6,729.92 km) |
| Spencer to Oignies | 4,318.78 mi (6,950.41 km) |
| Spencer to Oissel | 4,294.49 mi (6,911.31 km) |
| Spencer to Olivet | 4,383.81 mi (7,055.06 km) |
| Spencer to Ollioules | 4,734.91 mi (7,620.10 km) |
| Spencer to Olonne-sur-Mer | 4,295.92 mi (6,913.62 km) |
| Spencer to Oloron-Sainte-Marie | 4,476.61 mi (7,204.40 km) |
| Spencer to Onet Village | 4,555.22 mi (7,330.92 km) |
| Spencer to Onnaing | 4,343.68 mi (6,990.47 km) |
| Spencer to Orange | 4,651.08 mi (7,485.18 km) |
| Spencer to Orchies | 4,327.53 mi (6,964.48 km) |
| Spencer to Orleans | 4,382.56 mi (7,053.05 km) |
| Spencer to Orly | 4,366.47 mi (7,027.15 km) |
| Spencer to Ormesson-sur-Marne | 4,370.14 mi (7,033.06 km) |
| Spencer to Orsay | 4,360.73 mi (7,017.92 km) |
