| San Marino to Oberkirch | 5,835.31 mi (9,391.02 km) |
| San Marino to Obernburg am Main | 5,799.91 mi (9,334.05 km) |
| San Marino to Obernkirchen | 5,673.86 mi (9,131.20 km) |
| San Marino to Oberschleissheim | 5,954.78 mi (9,583.29 km) |
| San Marino to Oberstdorf | 5,960.69 mi (9,592.80 km) |
| San Marino to Obertraubling | 5,934.04 mi (9,549.92 km) |
| San Marino to Obertshausen | 5,779.10 mi (9,300.56 km) |
| San Marino to Oberursel | 5,764.49 mi (9,277.05 km) |
| San Marino to Ochsenfurt | 5,836.98 mi (9,393.71 km) |
| San Marino to Ochsenhausen | 5,915.95 mi (9,520.80 km) |
| San Marino to Ochtrup | 5,621.96 mi (9,047.67 km) |
| San Marino to Odenthal | 5,678.97 mi (9,139.42 km) |
| San Marino to Oelde | 5,668.54 mi (9,122.64 km) |
| San Marino to Oelsnitz | 5,856.49 mi (9,425.10 km) |
| San Marino to Oer-Erkenschwick | 5,652.16 mi (9,096.28 km) |
