| Rhondda to Dumas (Texas) | 4,656.35 mi (7,493.67 km) |
| Rhondda to Dumont (New Jersey) | 3,313.56 mi (5,332.66 km) |
| Rhondda to Duncan (Oklahoma) | 4,570.79 mi (7,355.98 km) |
| Rhondda to Duncanville (Texas) | 4,628.18 mi (7,448.34 km) |
| Rhondda to Dundalk (Maryland) | 3,489.10 mi (5,615.16 km) |
| Rhondda to Dunedin (Florida) | 4,283.59 mi (6,893.77 km) |
| Rhondda to Dunkirk (New York) | 3,464.83 mi (5,576.11 km) |
| Rhondda to Dunmore (Pennsylvania) | 3,359.77 mi (5,407.02 km) |
| Rhondda to Dunwoody (Georgia) | 4,057.30 mi (6,529.59 km) |
| Rhondda to Durango (Colorado) | 4,797.60 mi (7,720.99 km) |
| Rhondda to Durant (Oklahoma) | 4,539.24 mi (7,305.20 km) |
| Rhondda to Durham (North Carolina) | 3,737.55 mi (6,015.00 km) |
| Rhondda to Dyer (Indiana) | 3,830.60 mi (6,164.75 km) |
| Rhondda to Dyersburg (Tennessee) | 4,160.99 mi (6,696.47 km) |
| Rhondda to Eagan (Minnesota) | 3,891.81 mi (6,263.26 km) |
