| Castlebar to Dendermonde | 596.02 mi (959.20 km) |
| Castlebar to Dessel | 631.03 mi (1,015.55 km) |
| Castlebar to Destelbergen | 583.68 mi (939.34 km) |
| Castlebar to Deurne | 605.13 mi (973.86 km) |
| Castlebar to Diepenbeek | 651.90 mi (1,049.13 km) |
| Castlebar to Diest | 635.16 mi (1,022.18 km) |
| Castlebar to Diksmuide | 547.44 mi (881.01 km) |
| Castlebar to Dilbeek | 607.76 mi (978.09 km) |
| Castlebar to Dinant | 651.47 mi (1,048.44 km) |
| Castlebar to Dison | 677.43 mi (1,090.22 km) |
| Castlebar to Dour | 603.01 mi (970.45 km) |
| Castlebar to Drongen | 578.41 mi (930.86 km) |
| Castlebar to Duffel | 610.68 mi (982.80 km) |
| Castlebar to Durbuy | 669.90 mi (1,078.10 km) |
| Castlebar to Ecaussinnes-Lalaing | 613.26 mi (986.95 km) |
