| Hafnarfjordhur to Oerlinghausen | 1,375.04 mi (2,212.92 km) |
| Hafnarfjordhur to Oestrich-Winkel | 1,462.18 mi (2,353.16 km) |
| Hafnarfjordhur to Offenburg | 1,545.96 mi (2,487.98 km) |
| Hafnarfjordhur to Oftersheim | 1,512.64 mi (2,434.37 km) |
| Hafnarfjordhur to Ohrdruf | 1,492.70 mi (2,402.27 km) |
| Hafnarfjordhur to Ohringen | 1,546.79 mi (2,489.32 km) |
| Hafnarfjordhur to Olbernhau | 1,574.90 mi (2,534.56 km) |
| Hafnarfjordhur to Olching | 1,651.67 mi (2,658.10 km) |
| Hafnarfjordhur to Oldenburg | 1,301.86 mi (2,095.13 km) |
| Hafnarfjordhur to Oldenburg in Holstein | 1,321.96 mi (2,127.49 km) |
| Hafnarfjordhur to Olfen | 1,352.67 mi (2,176.91 km) |
| Hafnarfjordhur to Olpe | 1,402.38 mi (2,256.90 km) |
| Hafnarfjordhur to Olsberg | 1,402.41 mi (2,256.96 km) |
| Hafnarfjordhur to Oranienburg | 1,465.76 mi (2,358.91 km) |
| Hafnarfjordhur to Ortenberg | 1,471.45 mi (2,368.07 km) |
