| Delaware to Robertsville (New Jersey) | 462.42 mi (744.19 km) |
| Delaware to Robinson (Texas) | 993.44 mi (1,598.79 km) |
| Delaware to Robstown (Texas) | 1,198.07 mi (1,928.11 km) |
| Delaware to Rochester (Michigan) | 165.94 mi (267.06 km) |
| Delaware to Rochester (Minnesota) | 545.86 mi (878.47 km) |
| Delaware to Rochester (New Hampshire) | 656.24 mi (1,056.11 km) |
| Delaware to Rochester (New York) | 344.68 mi (554.71 km) |
| Delaware to Rochester Hills (Michigan) | 164.46 mi (264.67 km) |
| Delaware to Rock Hill (South Carolina) | 385.85 mi (620.96 km) |
| Delaware to Rock Island (Illinois) | 400.58 mi (644.67 km) |
| Delaware to Rock Springs (Wyoming) | 1,362.45 mi (2,192.65 km) |
| Delaware to Rockford (Illinois) | 339.55 mi (546.45 km) |
| Delaware to Rockledge (Florida) | 837.30 mi (1,347.50 km) |
| Delaware to Rocklin (California) | 2,020.68 mi (3,251.97 km) |
| Delaware to Rockport (Texas) | 1,162.24 mi (1,870.44 km) |
