| Darby to Reidsville (North Carolina) | 344.56 mi (554.52 km) |
| Darby to Reisterstown (Maryland) | 88.63 mi (142.63 km) |
| Darby to Rendon (Texas) | 1,320.84 mi (2,125.68 km) |
| Darby to Reno (Nevada) | 2,343.95 mi (3,772.22 km) |
| Darby to Renton (Washington) | 2,364.00 mi (3,804.49 km) |
| Darby to Republic (Missouri) | 999.47 mi (1,608.50 km) |
| Darby to Reston (Virginia) | 129.93 mi (209.11 km) |
| Darby to Revere (Massachusetts) | 280.67 mi (451.69 km) |
| Darby to Rexburg (Idaho) | 1,883.17 mi (3,030.68 km) |
| Darby to Reynoldsburg (Ohio) | 398.97 mi (642.08 km) |
| Darby to Rialto (California) | 2,336.40 mi (3,760.08 km) |
| Darby to Richardson (Texas) | 1,281.06 mi (2,061.67 km) |
| Darby to Richfield (Minnesota) | 978.65 mi (1,574.98 km) |
| Darby to Richfield (Wisconsin) | 708.03 mi (1,139.47 km) |
| Darby to Richland (Washington) | 2,234.59 mi (3,596.23 km) |
