| San Marino to Duluth (Minnesota) | 1,609.86 mi (2,590.82 km) |
| San Marino to Dumas (Texas) | 920.88 mi (1,482.01 km) |
| San Marino to Dumont (New Jersey) | 2,436.48 mi (3,921.14 km) |
| San Marino to Duncan (Oklahoma) | 1,150.51 mi (1,851.57 km) |
| San Marino to Duncanville (Texas) | 1,225.16 mi (1,971.71 km) |
| San Marino to Dundalk (Maryland) | 2,312.43 mi (3,721.49 km) |
| San Marino to Dunedin (Florida) | 2,121.52 mi (3,414.25 km) |
| San Marino to Dunkirk (New York) | 2,160.14 mi (3,476.41 km) |
| San Marino to Dunmore (Pennsylvania) | 2,351.13 mi (3,783.78 km) |
| San Marino to Dunwoody (Georgia) | 1,926.47 mi (3,100.35 km) |
| San Marino to Durango (Colorado) | 613.61 mi (987.51 km) |
| San Marino to Durant (Oklahoma) | 1,241.01 mi (1,997.21 km) |
| San Marino to Durham (North Carolina) | 2,206.67 mi (3,551.29 km) |
| San Marino to Dyer (Indiana) | 1,736.21 mi (2,794.15 km) |
| San Marino to Dyersburg (Tennessee) | 1,624.23 mi (2,613.95 km) |
