| Ontario to Duluth (Minnesota) | 1,591.71 mi (2,561.61 km) |
| Ontario to Dumas (Texas) | 893.76 mi (1,438.37 km) |
| Ontario to Dumont (New Jersey) | 2,412.45 mi (3,882.46 km) |
| Ontario to Duncan (Oklahoma) | 1,122.46 mi (1,806.43 km) |
| Ontario to Duncanville (Texas) | 1,196.28 mi (1,925.23 km) |
| Ontario to Dundalk (Maryland) | 2,287.47 mi (3,681.33 km) |
| Ontario to Dunedin (Florida) | 2,092.35 mi (3,367.31 km) |
| Ontario to Dunkirk (New York) | 2,136.97 mi (3,439.11 km) |
| Ontario to Dunmore (Pennsylvania) | 2,327.32 mi (3,745.46 km) |
| Ontario to Dunwoody (Georgia) | 1,898.77 mi (3,055.78 km) |
| Ontario to Durango (Colorado) | 589.54 mi (948.78 km) |
| Ontario to Durant (Oklahoma) | 1,212.73 mi (1,951.70 km) |
| Ontario to Durham (North Carolina) | 2,180.08 mi (3,508.50 km) |
| Ontario to Dyer (Indiana) | 1,712.73 mi (2,756.38 km) |
| Ontario to Dyersburg (Tennessee) | 1,597.27 mi (2,570.56 km) |
