| Castle Rock to Rhondda | 4,580.11 mi (7,370.98 km) |
| Castle Rock to Rhosllanerchrugog | 4,538.98 mi (7,304.79 km) |
| Castle Rock to Rhyl | 4,512.35 mi (7,261.93 km) |
| Castle Rock to Rhymney | 4,579.33 mi (7,369.71 km) |
| Castle Rock to Richmond | 4,695.96 mi (7,557.42 km) |
| Castle Rock to Rickmansworth | 4,682.81 mi (7,536.26 km) |
| Castle Rock to Ripley | 4,593.86 mi (7,393.10 km) |
| Castle Rock to Ripon | 4,547.13 mi (7,317.90 km) |
| Castle Rock to Risca | 4,592.00 mi (7,390.11 km) |
| Castle Rock to Rochdale | 4,546.14 mi (7,316.31 km) |
| Castle Rock to Rochester | 4,727.05 mi (7,607.45 km) |
| Castle Rock to Rock Ferry | 4,526.58 mi (7,284.82 km) |
| Castle Rock to Rogerstone | 4,594.00 mi (7,393.33 km) |
| Castle Rock to Romford | 4,707.69 mi (7,576.29 km) |
| Castle Rock to Romsey | 4,672.95 mi (7,520.39 km) |
