| Ronkonkoma to Dover (New Hampshire) | 200.95 mi (323.39 km) |
| Ronkonkoma to Dover (New Jersey) | 75.22 mi (121.06 km) |
| Ronkonkoma to Dover (Ohio) | 438.16 mi (705.15 km) |
| Ronkonkoma to Downers Grove (Illinois) | 775.09 mi (1,247.39 km) |
| Ronkonkoma to Downey (California) | 2,488.54 mi (4,004.92 km) |
| Ronkonkoma to Dranesville (Virginia) | 257.31 mi (414.10 km) |
| Ronkonkoma to Draper (Utah) | 2,013.89 mi (3,241.04 km) |
| Ronkonkoma to Drexel Heights (Arizona) | 2,171.71 mi (3,495.03 km) |
| Ronkonkoma to Drexel Hill (Pennsylvania) | 128.99 mi (207.59 km) |
| Ronkonkoma to Duarte (California) | 2,472.77 mi (3,979.54 km) |
| Ronkonkoma to Dublin (California) | 2,584.20 mi (4,158.87 km) |
| Ronkonkoma to Dublin (Georgia) | 787.31 mi (1,267.06 km) |
| Ronkonkoma to Dublin (Ohio) | 528.69 mi (850.85 km) |
| Ronkonkoma to Dubuque (Iowa) | 913.57 mi (1,470.25 km) |
| Ronkonkoma to Duluth (Georgia) | 764.97 mi (1,231.09 km) |
