| Castro Valley to Racale | 6,506.44 mi (10,471.10 km) |
| Castro Valley to Racconigi | 5,934.70 mi (9,550.97 km) |
| Castro Valley to Raffadali | 6,525.27 mi (10,501.41 km) |
| Castro Valley to Ragusa | 6,589.17 mi (10,604.25 km) |
| Castro Valley to Ramacca | 6,561.69 mi (10,560.01 km) |
| Castro Valley to Randazzo | 6,540.09 mi (10,525.26 km) |
| Castro Valley to Rapallo | 6,003.65 mi (9,661.95 km) |
| Castro Valley to Ravanusa | 6,546.39 mi (10,535.40 km) |
| Castro Valley to Ravenna | 6,085.12 mi (9,793.06 km) |
| Castro Valley to Recanati | 6,180.87 mi (9,947.16 km) |
| Castro Valley to Recco | 6,000.28 mi (9,656.51 km) |
| Castro Valley to Reggello | 6,107.80 mi (9,829.56 km) |
| Castro Valley to Reggio di Calabria | 6,547.12 mi (10,536.57 km) |
| Castro Valley to Reggio Emilia | 6,024.71 mi (9,695.83 km) |
| Castro Valley to Reggiolo | 6,017.75 mi (9,684.63 km) |
