| Ronkonkoma to Delaware (Ohio) | 523.33 mi (842.23 km) |
| Ronkonkoma to Delhi (California) | 2,533.60 mi (4,077.43 km) |
| Ronkonkoma to Delray Beach (Florida) | 1,068.39 mi (1,719.40 km) |
| Ronkonkoma to Deltona (Florida) | 940.35 mi (1,513.35 km) |
| Ronkonkoma to Deming (New Mexico) | 1,996.29 mi (3,212.72 km) |
| Ronkonkoma to Denison (Texas) | 1,372.85 mi (2,209.38 km) |
| Ronkonkoma to Dent (Ohio) | 620.17 mi (998.07 km) |
| Ronkonkoma to Denton (Texas) | 1,419.24 mi (2,284.05 km) |
| Ronkonkoma to Dentsville (South Carolina) | 632.41 mi (1,017.76 km) |
| Ronkonkoma to Denver (Colorado) | 1,665.95 mi (2,681.08 km) |
| Ronkonkoma to Depew (New York) | 321.87 mi (518.00 km) |
| Ronkonkoma to Derby (Connecticut) | 36.19 mi (58.24 km) |
| Ronkonkoma to Derby (Kansas) | 1,307.41 mi (2,104.07 km) |
| Ronkonkoma to Des Moines (Iowa) | 1,064.01 mi (1,712.37 km) |
| Ronkonkoma to Des Moines (Washington) | 2,440.93 mi (3,928.30 km) |
