| Diamond Bar to Racale | 6,603.93 mi (10,627.99 km) |
| Diamond Bar to Racconigi | 6,012.50 mi (9,676.18 km) |
| Diamond Bar to Raffadali | 6,596.70 mi (10,616.36 km) |
| Diamond Bar to Ragusa | 6,663.55 mi (10,723.95 km) |
| Diamond Bar to Ramacca | 6,637.54 mi (10,682.09 km) |
| Diamond Bar to Randazzo | 6,618.64 mi (10,651.66 km) |
| Diamond Bar to Rapallo | 6,084.95 mi (9,792.77 km) |
| Diamond Bar to Ravanusa | 6,619.02 mi (10,652.28 km) |
| Diamond Bar to Ravenna | 6,176.54 mi (9,940.19 km) |
| Diamond Bar to Recanati | 6,273.33 mi (10,095.95 km) |
| Diamond Bar to Recco | 6,081.36 mi (9,787.00 km) |
| Diamond Bar to Reggello | 6,194.35 mi (9,968.85 km) |
| Diamond Bar to Reggio di Calabria | 6,629.15 mi (10,668.58 km) |
| Diamond Bar to Reggio Emilia | 6,111.92 mi (9,836.18 km) |
| Diamond Bar to Reggiolo | 6,106.35 mi (9,827.23 km) |
