| Grimstad to Octeville | 730.00 mi (1,174.82 km) |
| Grimstad to Oignies | 588.15 mi (946.53 km) |
| Grimstad to Oissel | 691.91 mi (1,113.52 km) |
| Grimstad to Olivet | 774.37 mi (1,246.22 km) |
| Grimstad to Ollioules | 1,056.92 mi (1,700.94 km) |
| Grimstad to Olonne-sur-Mer | 922.73 mi (1,484.98 km) |
| Grimstad to Oloron-Sainte-Marie | 1,118.66 mi (1,800.31 km) |
| Grimstad to Onet Village | 998.71 mi (1,607.27 km) |
| Grimstad to Onnaing | 584.72 mi (941.02 km) |
| Grimstad to Orange | 994.44 mi (1,600.39 km) |
| Grimstad to Orchies | 584.05 mi (939.94 km) |
| Grimstad to Orleans | 771.71 mi (1,241.95 km) |
| Grimstad to Orly | 709.53 mi (1,141.88 km) |
| Grimstad to Ormesson-sur-Marne | 704.69 mi (1,134.10 km) |
| Grimstad to Orsay | 715.54 mi (1,151.55 km) |
