| Penarth to Red Bank (New Jersey) | 3,355.92 mi (5,400.83 km) |
| Penarth to Red Bank (Tennessee) | 4,055.56 mi (6,526.80 km) |
| Penarth to Red Bluff (California) | 5,124.19 mi (8,246.59 km) |
| Penarth to Red Hill (South Carolina) | 3,858.44 mi (6,209.55 km) |
| Penarth to Red Oak (Texas) | 4,644.56 mi (7,474.70 km) |
| Penarth to Red Wing (Minnesota) | 3,897.83 mi (6,272.95 km) |
| Penarth to Redan (Georgia) | 4,074.81 mi (6,557.77 km) |
| Penarth to Redding (California) | 5,105.31 mi (8,216.21 km) |
| Penarth to Redland (Maryland) | 3,535.85 mi (5,690.41 km) |
| Penarth to Redlands (California) | 5,309.15 mi (8,544.26 km) |
| Penarth to Redmond (Oregon) | 4,861.96 mi (7,824.57 km) |
| Penarth to Redmond (Washington) | 4,697.17 mi (7,559.37 km) |
| Penarth to Redondo Beach (California) | 5,360.19 mi (8,626.39 km) |
| Penarth to Redwood City (California) | 5,276.16 mi (8,491.15 km) |
| Penarth to Reedley (California) | 5,240.37 mi (8,433.57 km) |
