| Boulder to Ratingen | 4,921.56 mi (7,920.49 km) |
| Boulder to Ratzeburg | 4,930.76 mi (7,935.29 km) |
| Boulder to Raubling | 5,259.31 mi (8,464.05 km) |
| Boulder to Rauenberg | 5,076.58 mi (8,169.96 km) |
| Boulder to Raunheim | 5,033.01 mi (8,099.85 km) |
| Boulder to Ravensburg | 5,177.36 mi (8,332.16 km) |
| Boulder to Recke | 4,900.21 mi (7,886.12 km) |
| Boulder to Recklinghausen | 4,918.56 mi (7,915.66 km) |
| Boulder to Regen | 5,233.93 mi (8,423.20 km) |
| Boulder to Regensburg | 5,198.17 mi (8,365.65 km) |
| Boulder to Regenstauf | 5,194.36 mi (8,359.51 km) |
| Boulder to Rehau | 5,135.65 mi (8,265.04 km) |
| Boulder to Rehburg-Loccum | 4,942.92 mi (7,954.86 km) |
| Boulder to Rehlingen-Siersburg | 5,004.60 mi (8,054.13 km) |
| Boulder to Reichelsheim | 5,059.92 mi (8,143.15 km) |
