| Rock Island to Marrero (Louisiana) | 800.72 mi (1,288.64 km) |
| Rock Island to Marshall (Minnesota) | 334.08 mi (537.64 km) |
| Rock Island to Marshall (Missouri) | 213.33 mi (343.33 km) |
| Rock Island to Marshall (Texas) | 651.11 mi (1,047.86 km) |
| Rock Island to Marshalltown (Iowa) | 125.98 mi (202.75 km) |
| Rock Island to Marshfield (Wisconsin) | 221.57 mi (356.58 km) |
| Rock Island to Martha Lake (Washington) | 1,604.12 mi (2,581.58 km) |
| Rock Island to Martin (Tennessee) | 366.54 mi (589.89 km) |
| Rock Island to Martinez (California) | 1,683.10 mi (2,708.68 km) |
| Rock Island to Martinez (Georgia) | 718.92 mi (1,156.99 km) |
| Rock Island to Martinsburg (West Virginia) | 676.38 mi (1,088.52 km) |
| Rock Island to Martinsville (Indiana) | 260.35 mi (418.99 km) |
| Rock Island to Martinsville (New Jersey) | 835.21 mi (1,344.14 km) |
| Rock Island to Martinsville (Virginia) | 662.58 mi (1,066.33 km) |
| Rock Island to Maryland City (Maryland) | 743.50 mi (1,196.55 km) |
