| Euclid to Octeville | 3,715.91 mi (5,980.18 km) |
| Euclid to Oignies | 3,877.30 mi (6,239.91 km) |
| Euclid to Oissel | 3,835.47 mi (6,172.59 km) |
| Euclid to Olivet | 3,914.16 mi (6,299.24 km) |
| Euclid to Ollioules | 4,241.06 mi (6,825.33 km) |
| Euclid to Olonne-sur-Mer | 3,801.10 mi (6,117.28 km) |
| Euclid to Oloron-Sainte-Marie | 3,957.94 mi (6,369.69 km) |
| Euclid to Onet Village | 4,058.20 mi (6,531.03 km) |
| Euclid to Onnaing | 3,903.62 mi (6,282.28 km) |
| Euclid to Orange | 4,160.96 mi (6,696.41 km) |
| Euclid to Orchies | 3,887.01 mi (6,255.53 km) |
| Euclid to Orleans | 3,913.29 mi (6,297.84 km) |
| Euclid to Orly | 3,906.64 mi (6,287.12 km) |
| Euclid to Ormesson-sur-Marne | 3,911.23 mi (6,294.51 km) |
| Euclid to Orsay | 3,899.72 mi (6,276.00 km) |
