| Delaware to Romeoville (Illinois) | 278.19 mi (447.71 km) |
| Delaware to Romulus (Michigan) | 134.80 mi (216.94 km) |
| Delaware to Ronkonkoma (New York) | 523.33 mi (842.23 km) |
| Delaware to Roosevelt (New York) | 499.25 mi (803.46 km) |
| Delaware to Rosamond (California) | 1,947.21 mi (3,133.73 km) |
| Delaware to Rosaryville (Maryland) | 348.99 mi (561.64 km) |
| Delaware to Roscoe (Illinois) | 341.35 mi (549.36 km) |
| Delaware to Rose Hill (Virginia) | 334.23 mi (537.89 km) |
| Delaware to Roseburg (Oregon) | 2,065.88 mi (3,324.71 km) |
| Delaware to Rosedale (California) | 1,986.35 mi (3,196.72 km) |
| Delaware to Rosedale (Maryland) | 354.65 mi (570.75 km) |
| Delaware to Roselle (Illinois) | 285.87 mi (460.07 km) |
| Delaware to Roselle (New Jersey) | 463.80 mi (746.42 km) |
| Delaware to Roselle Park (New Jersey) | 463.46 mi (745.86 km) |
| Delaware to Rosemead (California) | 1,961.08 mi (3,156.05 km) |
