| Ronkonkoma to Duluth (Minnesota) | 1,030.87 mi (1,659.03 km) |
| Ronkonkoma to Dumas (Texas) | 1,592.27 mi (2,562.51 km) |
| Ronkonkoma to Dumont (New Jersey) | 46.37 mi (74.63 km) |
| Ronkonkoma to Duncan (Oklahoma) | 1,417.87 mi (2,281.84 km) |
| Ronkonkoma to Duncanville (Texas) | 1,427.00 mi (2,296.53 km) |
| Ronkonkoma to Dundalk (Maryland) | 207.33 mi (333.67 km) |
| Ronkonkoma to Dunedin (Florida) | 1,038.55 mi (1,671.38 km) |
| Ronkonkoma to Dunkirk (New York) | 340.72 mi (548.34 km) |
| Ronkonkoma to Dunmore (Pennsylvania) | 135.97 mi (218.82 km) |
| Ronkonkoma to Dunwoody (Georgia) | 774.89 mi (1,247.07 km) |
| Ronkonkoma to Durango (Colorado) | 1,868.78 mi (3,007.52 km) |
| Ronkonkoma to Durant (Oklahoma) | 1,356.02 mi (2,182.30 km) |
| Ronkonkoma to Durham (North Carolina) | 456.96 mi (735.41 km) |
| Ronkonkoma to Dyer (Indiana) | 749.03 mi (1,205.45 km) |
| Ronkonkoma to Dyersburg (Tennessee) | 937.41 mi (1,508.61 km) |
