| Ronkonkoma to Darby (Pennsylvania) | 127.94 mi (205.90 km) |
| Ronkonkoma to Dardenne Prairie (Missouri) | 943.91 mi (1,519.08 km) |
| Ronkonkoma to Darien (Illinois) | 773.29 mi (1,244.49 km) |
| Ronkonkoma to Davenport (Iowa) | 908.97 mi (1,462.85 km) |
| Ronkonkoma to Davidson (North Carolina) | 556.52 mi (895.63 km) |
| Ronkonkoma to Davie (Florida) | 1,096.98 mi (1,765.41 km) |
| Ronkonkoma to Davis (California) | 2,556.36 mi (4,114.06 km) |
| Ronkonkoma to Dayton (Nevada) | 2,430.19 mi (3,911.01 km) |
| Ronkonkoma to Dayton (Ohio) | 587.57 mi (945.60 km) |
| Ronkonkoma to Daytona Beach (Florida) | 919.05 mi (1,479.07 km) |
| Ronkonkoma to De Pere (Wisconsin) | 799.20 mi (1,286.19 km) |
| Ronkonkoma to De Witt (New York) | 216.26 mi (348.03 km) |
| Ronkonkoma to Dearborn (Michigan) | 531.56 mi (855.46 km) |
| Ronkonkoma to Dearborn Heights (Michigan) | 534.83 mi (860.73 km) |
| Ronkonkoma to DeBary (Florida) | 944.83 mi (1,520.56 km) |
