| Rock Island to Ukiah (California) | 1,716.38 mi (2,762.25 km) |
| Rock Island to Union (Missouri) | 210.48 mi (338.73 km) |
| Rock Island to Union City (California) | 1,686.73 mi (2,714.53 km) |
| Rock Island to Union City (Georgia) | 635.91 mi (1,023.41 km) |
| Rock Island to Union City (New Jersey) | 861.52 mi (1,386.48 km) |
| Rock Island to Union City (Tennessee) | 358.07 mi (576.25 km) |
| Rock Island to Union Hill-Novelty Hill (Washington) | 1,593.84 mi (2,565.03 km) |
| Rock Island to Union Park (Florida) | 1,035.16 mi (1,665.93 km) |
| Rock Island to Uniondale (New York) | 884.69 mi (1,423.76 km) |
| Rock Island to Universal City (Texas) | 930.04 mi (1,496.76 km) |
| Rock Island to University (Florida) | 1,033.28 mi (1,662.91 km) |
| Rock Island to University City (Missouri) | 194.21 mi (312.54 km) |
| Rock Island to University Heights (Ohio) | 468.12 mi (753.36 km) |
| Rock Island to University of California-Santa Barbara (California) | 1,658.82 mi (2,669.62 km) |
| Rock Island to University Park (Texas) | 686.28 mi (1,104.47 km) |
