| South Portland to Dendermonde | 3,370.24 mi (5,423.87 km) |
| South Portland to Dessel | 3,405.79 mi (5,481.10 km) |
| South Portland to Destelbergen | 3,357.72 mi (5,403.73 km) |
| South Portland to Deurne | 3,379.83 mi (5,439.31 km) |
| South Portland to Diepenbeek | 3,426.54 mi (5,514.48 km) |
| South Portland to Diest | 3,409.77 mi (5,487.49 km) |
| South Portland to Diksmuide | 3,320.45 mi (5,343.75 km) |
| South Portland to Dilbeek | 3,381.50 mi (5,442.00 km) |
| South Portland to Dinant | 3,423.62 mi (5,509.79 km) |
| South Portland to Dison | 3,451.81 mi (5,555.14 km) |
| South Portland to Dour | 3,373.91 mi (5,429.79 km) |
| South Portland to Drongen | 3,352.34 mi (5,395.08 km) |
| South Portland to Duffel | 3,385.26 mi (5,448.05 km) |
| South Portland to Durbuy | 3,443.17 mi (5,541.24 km) |
| South Portland to Ecaussinnes-Lalaing | 3,385.82 mi (5,448.95 km) |
