| Darby to Rockville (Maryland) | 116.39 mi (187.32 km) |
| Darby to Rockville Centre (New York) | 99.75 mi (160.53 km) |
| Darby to Rockwall (Texas) | 1,268.97 mi (2,042.21 km) |
| Darby to Rocky Mount (North Carolina) | 306.19 mi (492.77 km) |
| Darby to Rocky Point (New York) | 140.93 mi (226.80 km) |
| Darby to Rocky River (Ohio) | 361.40 mi (581.62 km) |
| Darby to Roessleville (New York) | 206.30 mi (332.01 km) |
| Darby to Rogers (Arkansas) | 1,054.49 mi (1,697.04 km) |
| Darby to Rogers (Minnesota) | 997.99 mi (1,606.11 km) |
| Darby to Rohnert Park (California) | 2,514.29 mi (4,046.37 km) |
| Darby to Rolla (Missouri) | 895.90 mi (1,441.82 km) |
| Darby to Rolling Meadows (Illinois) | 681.34 mi (1,096.51 km) |
| Darby to Roma (Texas) | 1,651.78 mi (2,658.29 km) |
| Darby to Rome (Georgia) | 671.52 mi (1,080.70 km) |
| Darby to Rome (New York) | 228.66 mi (368.00 km) |
