| Herndon to Rockville (Maryland) | 14.69 mi (23.64 km) |
| Herndon to Rockville Centre (New York) | 230.79 mi (371.42 km) |
| Herndon to Rockwall (Texas) | 1,142.00 mi (1,837.88 km) |
| Herndon to Rocky Mount (North Carolina) | 208.63 mi (335.77 km) |
| Herndon to Rocky Point (New York) | 271.99 mi (437.73 km) |
| Herndon to Rocky River (Ohio) | 292.09 mi (470.07 km) |
| Herndon to Roessleville (New York) | 318.58 mi (512.71 km) |
| Herndon to Rogers (Arkansas) | 934.00 mi (1,503.12 km) |
| Herndon to Rogers (Minnesota) | 932.52 mi (1,500.74 km) |
| Herndon to Rohnert Park (California) | 2,419.22 mi (3,893.35 km) |
| Herndon to Rolla (Missouri) | 780.09 mi (1,255.44 km) |
| Herndon to Rolling Meadows (Illinois) | 597.99 mi (962.38 km) |
| Herndon to Roma (Texas) | 1,520.82 mi (2,447.52 km) |
| Herndon to Rome (Georgia) | 540.67 mi (870.13 km) |
| Herndon to Rome (New York) | 310.17 mi (499.17 km) |
