| San Marino to Oerlinghausen | 5,676.51 mi (9,135.46 km) |
| San Marino to Oestrich-Winkel | 5,757.76 mi (9,266.22 km) |
| San Marino to Offenburg | 5,834.10 mi (9,389.08 km) |
| San Marino to Oftersheim | 5,807.55 mi (9,346.35 km) |
| San Marino to Ohrdruf | 5,794.37 mi (9,325.13 km) |
| San Marino to Ohringen | 5,843.73 mi (9,404.57 km) |
| San Marino to Olbernhau | 5,875.25 mi (9,455.30 km) |
| San Marino to Olching | 5,950.07 mi (9,575.72 km) |
| San Marino to Oldenburg | 5,603.51 mi (9,017.97 km) |
| San Marino to Oldenburg in Holstein | 5,616.09 mi (9,038.22 km) |
| San Marino to Olfen | 5,652.26 mi (9,096.44 km) |
| San Marino to Olpe | 5,700.97 mi (9,174.82 km) |
| San Marino to Olsberg | 5,702.89 mi (9,177.91 km) |
| San Marino to Oranienburg | 5,759.98 mi (9,269.79 km) |
| San Marino to Ortenberg | 5,770.70 mi (9,287.05 km) |
