| San Marino to Orangeburg (South Carolina) | 2,126.75 mi (3,422.67 km) |
| San Marino to Orangevale (California) | 359.63 mi (578.77 km) |
| San Marino to Orchards (Washington) | 832.41 mi (1,339.64 km) |
| San Marino to Orcutt (California) | 141.24 mi (227.30 km) |
| San Marino to Oregon (Ohio) | 1,946.96 mi (3,133.33 km) |
| San Marino to Oregon (Wisconsin) | 1,657.44 mi (2,667.40 km) |
| San Marino to Oregon City (Oregon) | 810.55 mi (1,304.45 km) |
| San Marino to Orem (Utah) | 553.41 mi (890.62 km) |
| San Marino to Orinda (California) | 345.00 mi (555.23 km) |
| San Marino to Orland Park (Illinois) | 1,719.07 mi (2,766.58 km) |
| San Marino to Orlando (Florida) | 2,193.89 mi (3,530.73 km) |
| San Marino to Ormond Beach (Florida) | 2,188.88 mi (3,522.66 km) |
| San Marino to Oro Valley (Arizona) | 428.58 mi (689.74 km) |
| San Marino to Oroville (California) | 417.61 mi (672.08 km) |
| San Marino to Oshkosh (Wisconsin) | 1,714.51 mi (2,759.23 km) |
