| San Marino to Dover (New Hampshire) | 2,588.08 mi (4,165.12 km) |
| San Marino to Dover (New Jersey) | 2,407.14 mi (3,873.91 km) |
| San Marino to Dover (Ohio) | 2,045.36 mi (3,291.70 km) |
| San Marino to Downers Grove (Illinois) | 1,712.90 mi (2,756.65 km) |
| San Marino to Downey (California) | 12.79 mi (20.58 km) |
| San Marino to Dranesville (Virginia) | 2,267.12 mi (3,648.58 km) |
| San Marino to Draper (Utah) | 558.22 mi (898.36 km) |
| San Marino to Drexel Heights (Arizona) | 430.89 mi (693.44 km) |
| San Marino to Drexel Hill (Pennsylvania) | 2,372.15 mi (3,817.60 km) |
| San Marino to Duarte (California) | 9.68 mi (15.59 km) |
| San Marino to Dublin (California) | 326.22 mi (525.00 km) |
| San Marino to Dublin (Georgia) | 2,024.16 mi (3,257.57 km) |
| San Marino to Dublin (Ohio) | 1,957.27 mi (3,149.92 km) |
| San Marino to Dubuque (Iowa) | 1,585.88 mi (2,552.23 km) |
| San Marino to Duluth (Georgia) | 1,934.91 mi (3,113.93 km) |
