| San Marino to Oskaloosa (Iowa) | 1,471.42 mi (2,368.03 km) |
| San Marino to Oswego (Illinois) | 1,695.48 mi (2,728.61 km) |
| San Marino to Oswego (New York) | 2,305.78 mi (3,710.79 km) |
| San Marino to Otsego (Minnesota) | 1,503.80 mi (2,420.13 km) |
| San Marino to Ottawa (Illinois) | 1,667.28 mi (2,683.22 km) |
| San Marino to Ottawa (Kansas) | 1,304.73 mi (2,099.75 km) |
| San Marino to Ottumwa (Iowa) | 1,479.18 mi (2,380.51 km) |
| San Marino to Overland (Missouri) | 1,568.45 mi (2,524.18 km) |
| San Marino to Overland Park (Kansas) | 1,337.94 mi (2,153.20 km) |
| San Marino to Overlea (Maryland) | 2,310.70 mi (3,718.70 km) |
| San Marino to Oviedo (Florida) | 2,198.29 mi (3,537.81 km) |
| San Marino to Owasso (Oklahoma) | 1,263.99 mi (2,034.20 km) |
| San Marino to Owatonna (Minnesota) | 1,493.12 mi (2,402.95 km) |
| San Marino to Owensboro (Kentucky) | 1,743.93 mi (2,806.59 km) |
| San Marino to Owings Mills (Maryland) | 2,295.88 mi (3,694.85 km) |
