| Rock Island to Oskaloosa (Iowa) | 107.38 mi (172.81 km) |
| Rock Island to Oswego (Illinois) | 116.99 mi (188.28 km) |
| Rock Island to Oswego (New York) | 729.82 mi (1,174.53 km) |
| Rock Island to Otsego (Minnesota) | 303.37 mi (488.23 km) |
| Rock Island to Ottawa (Illinois) | 91.36 mi (147.04 km) |
| Rock Island to Ottawa (Kansas) | 317.17 mi (510.43 km) |
| Rock Island to Ottumwa (Iowa) | 100.32 mi (161.45 km) |
| Rock Island to Overland (Missouri) | 191.95 mi (308.91 km) |
| Rock Island to Overland Park (Kansas) | 280.64 mi (451.65 km) |
| Rock Island to Overlea (Maryland) | 753.15 mi (1,212.08 km) |
| Rock Island to Oviedo (Florida) | 1,030.93 mi (1,659.11 km) |
| Rock Island to Owasso (Oklahoma) | 455.75 mi (733.46 km) |
| Rock Island to Owatonna (Minnesota) | 225.45 mi (362.83 km) |
| Rock Island to Owensboro (Kentucky) | 315.88 mi (508.35 km) |
| Rock Island to Owings Mills (Maryland) | 738.19 mi (1,188.01 km) |
