| Rock Island to Reading (Pennsylvania) | 768.38 mi (1,236.59 km) |
| Rock Island to Red Bank (New Jersey) | 864.55 mi (1,391.35 km) |
| Rock Island to Red Bank (Tennessee) | 524.32 mi (843.82 km) |
| Rock Island to Red Bluff (California) | 1,648.49 mi (2,652.98 km) |
| Rock Island to Red Hill (South Carolina) | 825.40 mi (1,328.36 km) |
| Rock Island to Red Oak (Texas) | 706.26 mi (1,136.62 km) |
| Rock Island to Red Wing (Minnesota) | 237.98 mi (383.00 km) |
| Rock Island to Redan (Georgia) | 638.87 mi (1,028.16 km) |
| Rock Island to Redding (California) | 1,648.62 mi (2,653.20 km) |
| Rock Island to Redland (Maryland) | 725.36 mi (1,167.35 km) |
| Rock Island to Redlands (California) | 1,532.80 mi (2,466.80 km) |
| Rock Island to Redmond (Oregon) | 1,552.40 mi (2,498.34 km) |
| Rock Island to Redmond (Washington) | 1,597.93 mi (2,571.62 km) |
| Rock Island to Redondo Beach (California) | 1,600.30 mi (2,575.43 km) |
| Rock Island to Redwood City (California) | 1,699.73 mi (2,735.46 km) |
