| Dumbarton to Octeville | 453.54 mi (729.90 km) |
| Dumbarton to Oignies | 490.62 mi (789.57 km) |
| Dumbarton to Oissel | 514.11 mi (827.38 km) |
| Dumbarton to Olivet | 622.37 mi (1,001.61 km) |
| Dumbarton to Ollioules | 998.19 mi (1,606.44 km) |
| Dumbarton to Olonne-sur-Mer | 661.43 mi (1,064.46 km) |
| Dumbarton to Oloron-Sainte-Marie | 898.65 mi (1,446.23 km) |
| Dumbarton to Onet Village | 859.77 mi (1,383.67 km) |
| Dumbarton to Onnaing | 511.24 mi (822.75 km) |
| Dumbarton to Orange | 914.14 mi (1,471.17 km) |
| Dumbarton to Orchies | 496.95 mi (799.76 km) |
| Dumbarton to Orleans | 620.09 mi (997.94 km) |
| Dumbarton to Orly | 577.43 mi (929.29 km) |
| Dumbarton to Ormesson-sur-Marne | 578.00 mi (930.21 km) |
| Dumbarton to Orsay | 575.93 mi (926.87 km) |
