| Ronkonkoma to Decatur (Alabama) | 870.33 mi (1,400.66 km) |
| Ronkonkoma to Decatur (Georgia) | 781.99 mi (1,258.49 km) |
| Ronkonkoma to Decatur (Illinois) | 834.16 mi (1,342.45 km) |
| Ronkonkoma to Deer Park (New York) | 10.71 mi (17.23 km) |
| Ronkonkoma to Deer Park (Texas) | 1,452.90 mi (2,338.22 km) |
| Ronkonkoma to Deerfield (Illinois) | 767.08 mi (1,234.50 km) |
| Ronkonkoma to Deerfield Beach (Florida) | 1,078.91 mi (1,736.34 km) |
| Ronkonkoma to Defiance (Ohio) | 586.31 mi (943.58 km) |
| Ronkonkoma to DeForest (Wisconsin) | 847.82 mi (1,364.43 km) |
| Ronkonkoma to DeKalb (Illinois) | 812.73 mi (1,307.97 km) |
| Ronkonkoma to Del Aire (California) | 2,501.58 mi (4,025.90 km) |
| Ronkonkoma to Del City (Oklahoma) | 1,367.47 mi (2,200.72 km) |
| Ronkonkoma to Del Rio (Texas) | 1,746.42 mi (2,810.60 km) |
| Ronkonkoma to DeLand (Florida) | 935.16 mi (1,504.99 km) |
| Ronkonkoma to Delano (California) | 2,497.39 mi (4,019.16 km) |
