| Holyhead to Dover (New Jersey) | 3,258.69 mi (5,244.35 km) |
| Holyhead to Dover (Ohio) | 3,548.60 mi (5,710.92 km) |
| Holyhead to Downers Grove (Illinois) | 3,741.04 mi (6,020.61 km) |
| Holyhead to Downey (California) | 5,217.98 mi (8,397.52 km) |
| Holyhead to Dranesville (Virginia) | 3,456.69 mi (5,563.00 km) |
| Holyhead to Draper (Utah) | 4,648.90 mi (7,481.68 km) |
| Holyhead to Drexel Heights (Arizona) | 5,079.72 mi (8,175.02 km) |
| Holyhead to Drexel Hill (Pennsylvania) | 3,330.46 mi (5,359.85 km) |
| Holyhead to Duarte (California) | 5,199.41 mi (8,367.65 km) |
| Holyhead to Dublin (California) | 5,119.52 mi (8,239.07 km) |
| Holyhead to Dublin (Georgia) | 3,990.86 mi (6,422.66 km) |
| Holyhead to Dublin (Ohio) | 3,633.04 mi (5,846.81 km) |
| Holyhead to Dubuque (Iowa) | 3,808.23 mi (6,128.76 km) |
| Holyhead to Duluth (Georgia) | 3,966.81 mi (6,383.97 km) |
| Holyhead to Duluth (Minnesota) | 3,660.49 mi (5,890.99 km) |
