| Rock Island to Orangeburg (South Carolina) | 765.52 mi (1,231.99 km) |
| Rock Island to Orangevale (California) | 1,622.56 mi (2,611.26 km) |
| Rock Island to Orchards (Washington) | 1,614.27 mi (2,597.92 km) |
| Rock Island to Orcutt (California) | 1,674.51 mi (2,694.86 km) |
| Rock Island to Oregon (Ohio) | 369.79 mi (595.12 km) |
| Rock Island to Oregon (Wisconsin) | 117.66 mi (189.35 km) |
| Rock Island to Oregon City (Oregon) | 1,617.90 mi (2,603.77 km) |
| Rock Island to Orem (Utah) | 1,103.29 mi (1,775.58 km) |
| Rock Island to Orinda (California) | 1,688.91 mi (2,718.03 km) |
| Rock Island to Orland Park (Illinois) | 141.03 mi (226.96 km) |
| Rock Island to Orlando (Florida) | 1,037.68 mi (1,669.98 km) |
| Rock Island to Ormond Beach (Florida) | 994.76 mi (1,600.91 km) |
| Rock Island to Oro Valley (Arizona) | 1,283.41 mi (2,065.45 km) |
| Rock Island to Oroville (California) | 1,625.02 mi (2,615.22 km) |
| Rock Island to Oshkosh (Wisconsin) | 204.00 mi (328.31 km) |
