| Ontario to Dover (New Hampshire) | 2,565.30 mi (4,128.45 km) |
| Ontario to Dover (New Jersey) | 2,383.06 mi (3,835.16 km) |
| Ontario to Dover (Ohio) | 2,021.04 mi (3,252.54 km) |
| Ontario to Downers Grove (Illinois) | 1,689.69 mi (2,719.29 km) |
| Ontario to Downey (California) | 30.86 mi (49.67 km) |
| Ontario to Dranesville (Virginia) | 2,242.00 mi (3,608.15 km) |
| Ontario to Draper (Utah) | 546.35 mi (879.27 km) |
| Ontario to Drexel Heights (Arizona) | 401.46 mi (646.09 km) |
| Ontario to Drexel Hill (Pennsylvania) | 2,347.57 mi (3,778.04 km) |
| Ontario to Duarte (California) | 21.40 mi (34.44 km) |
| Ontario to Dublin (California) | 349.51 mi (562.48 km) |
| Ontario to Dublin (Georgia) | 1,996.05 mi (3,212.33 km) |
| Ontario to Dublin (Ohio) | 1,932.70 mi (3,110.38 km) |
| Ontario to Dubuque (Iowa) | 1,563.53 mi (2,516.26 km) |
| Ontario to Duluth (Georgia) | 1,907.24 mi (3,069.41 km) |
