| Rock Island to Oakleaf Plantation (Florida) | 920.75 mi (1,481.81 km) |
| Rock Island to Oakley (California) | 1,661.44 mi (2,673.83 km) |
| Rock Island to Oakton (Virginia) | 722.61 mi (1,162.93 km) |
| Rock Island to Oakville (Missouri) | 209.26 mi (336.78 km) |
| Rock Island to Oatfield (Oregon) | 1,617.82 mi (2,603.63 km) |
| Rock Island to Ocala (Florida) | 972.06 mi (1,564.38 km) |
| Rock Island to Ocean Acres (New Jersey) | 862.11 mi (1,387.43 km) |
| Rock Island to Ocean City (New Jersey) | 853.60 mi (1,373.74 km) |
| Rock Island to Ocean Pines (Maryland) | 843.80 mi (1,357.96 km) |
| Rock Island to Ocean Pointe (Hawaii) | 4,106.87 mi (6,609.37 km) |
| Rock Island to Ocean Springs (Mississippi) | 770.82 mi (1,240.51 km) |
| Rock Island to Oceanside (California) | 1,566.74 mi (2,521.43 km) |
| Rock Island to Oceanside (New York) | 883.46 mi (1,421.79 km) |
| Rock Island to Ocoee (Florida) | 1,025.90 mi (1,651.03 km) |
| Rock Island to Oconomowoc (Wisconsin) | 155.13 mi (249.66 km) |
