| Rock Island to Portage (Indiana) | 176.19 mi (283.55 km) |
| Rock Island to Portage (Michigan) | 261.85 mi (421.41 km) |
| Rock Island to Portage (Wisconsin) | 154.50 mi (248.64 km) |
| Rock Island to Portales (New Mexico) | 858.75 mi (1,382.02 km) |
| Rock Island to Porterville (California) | 1,569.85 mi (2,526.43 km) |
| Rock Island to Portland (Maine) | 1,041.96 mi (1,676.87 km) |
| Rock Island to Portland (Oregon) | 1,620.29 mi (2,607.60 km) |
| Rock Island to Portland (Tennessee) | 401.18 mi (645.64 km) |
| Rock Island to Portland (Texas) | 1,012.40 mi (1,629.31 km) |
| Rock Island to Portsmouth (New Hampshire) | 1,015.97 mi (1,635.05 km) |
| Rock Island to Portsmouth (Ohio) | 444.89 mi (715.98 km) |
| Rock Island to Portsmouth (Virginia) | 825.23 mi (1,328.08 km) |
| Rock Island to Post Falls (Idaho) | 1,358.95 mi (2,187.02 km) |
| Rock Island to Potomac (Maryland) | 725.39 mi (1,167.41 km) |
| Rock Island to Potomac Park (California) | 1,585.39 mi (2,551.44 km) |
