| San Marino to Nuth | 5,647.90 mi (9,089.41 km) |
| San Marino to Oegstgeest | 5,542.82 mi (8,920.30 km) |
| San Marino to Oirschot | 5,601.39 mi (9,014.57 km) |
| San Marino to Oisterwijk | 5,594.27 mi (9,003.11 km) |
| San Marino to Oldebroek | 5,572.17 mi (8,967.53 km) |
| San Marino to Oldenzaal | 5,608.92 mi (9,026.69 km) |
| San Marino to Ommen | 5,583.91 mi (8,986.44 km) |
| San Marino to Oosterend | 5,549.51 mi (8,931.07 km) |
| San Marino to Oosterhout | 5,581.00 mi (8,981.75 km) |
| San Marino to Oosterwolde | 5,556.66 mi (8,942.58 km) |
| San Marino to Oostzaan | 5,543.01 mi (8,920.62 km) |
| San Marino to Opmeer | 5,531.91 mi (8,902.75 km) |
| San Marino to Oss | 5,594.70 mi (9,003.80 km) |
| San Marino to Oud-Beijerland | 5,558.70 mi (8,945.86 km) |
| San Marino to Oudenbosch | 5,573.56 mi (8,969.78 km) |
