| San Marcos to Dover (New Hampshire) | 2,573.78 mi (4,142.09 km) |
| San Marcos to Dover (New Jersey) | 2,386.81 mi (3,841.19 km) |
| San Marcos to Dover (Ohio) | 2,024.02 mi (3,257.35 km) |
| San Marcos to Downers Grove (Illinois) | 1,697.25 mi (2,731.47 km) |
| San Marcos to Downey (California) | 78.19 mi (125.84 km) |
| San Marcos to Dranesville (Virginia) | 2,241.54 mi (3,607.41 km) |
| San Marcos to Draper (Utah) | 587.11 mi (944.87 km) |
| San Marcos to Drexel Heights (Arizona) | 362.88 mi (584.00 km) |
| San Marcos to Drexel Hill (Pennsylvania) | 2,349.31 mi (3,780.86 km) |
| San Marcos to Duarte (California) | 83.77 mi (134.82 km) |
| San Marcos to Dublin (California) | 413.23 mi (665.03 km) |
| San Marcos to Dublin (Georgia) | 1,979.64 mi (3,185.93 km) |
| San Marcos to Dublin (Ohio) | 1,934.79 mi (3,113.74 km) |
| San Marcos to Dubuque (Iowa) | 1,574.31 mi (2,533.61 km) |
| San Marcos to Duluth (Georgia) | 1,893.91 mi (3,047.96 km) |
