| Darby to Robertsville (New Jersey) | 58.70 mi (94.48 km) |
| Darby to Robinson (Texas) | 1,354.31 mi (2,179.55 km) |
| Darby to Robstown (Texas) | 1,527.73 mi (2,458.64 km) |
| Darby to Rochester (Michigan) | 450.20 mi (724.53 km) |
| Darby to Rochester (Minnesota) | 926.57 mi (1,491.17 km) |
| Darby to Rochester (New Hampshire) | 321.49 mi (517.39 km) |
| Darby to Rochester (New York) | 255.25 mi (410.78 km) |
| Darby to Rochester Hills (Michigan) | 451.33 mi (726.35 km) |
| Darby to Rock Hill (South Carolina) | 467.06 mi (751.66 km) |
| Darby to Rock Island (Illinois) | 808.65 mi (1,301.40 km) |
| Darby to Rock Springs (Wyoming) | 1,769.62 mi (2,847.94 km) |
| Darby to Rockford (Illinois) | 735.82 mi (1,184.19 km) |
| Darby to Rockledge (Florida) | 860.06 mi (1,384.13 km) |
| Darby to Rocklin (California) | 2,430.20 mi (3,911.03 km) |
| Darby to Rockport (Texas) | 1,489.20 mi (2,396.64 km) |
