| San Felice Circeo to Oerlinghausen | 770.33 mi (1,239.72 km) |
| San Felice Circeo to Oestrich-Winkel | 653.35 mi (1,051.46 km) |
| San Felice Circeo to Offenburg | 559.66 mi (900.69 km) |
| San Felice Circeo to Oftersheim | 603.05 mi (970.51 km) |
| San Felice Circeo to Ohrdruf | 672.32 mi (1,082.00 km) |
| San Felice Circeo to Ohringen | 577.29 mi (929.05 km) |
| San Felice Circeo to Olbernhau | 651.75 mi (1,048.88 km) |
| San Felice Circeo to Olching | 489.04 mi (787.03 km) |
| San Felice Circeo to Oldenburg | 853.63 mi (1,373.78 km) |
| San Felice Circeo to Oldenburg in Holstein | 908.39 mi (1,461.92 km) |
| San Felice Circeo to Olfen | 772.92 mi (1,243.90 km) |
| San Felice Circeo to Olpe | 720.81 mi (1,160.03 km) |
| San Felice Circeo to Olsberg | 732.35 mi (1,178.60 km) |
| San Felice Circeo to Oranienburg | 795.92 mi (1,280.91 km) |
| San Felice Circeo to Ortenberg | 659.28 mi (1,061.01 km) |
