| San Marcos to Darby (Pennsylvania) | 2,351.65 mi (3,784.61 km) |
| San Marcos to Dardenne Prairie (Missouri) | 1,523.31 mi (2,451.54 km) |
| San Marcos to Darien (Illinois) | 1,698.36 mi (2,733.25 km) |
| San Marcos to Davenport (Iowa) | 1,563.22 mi (2,515.75 km) |
| San Marcos to Davidson (North Carolina) | 2,069.20 mi (3,330.06 km) |
| San Marcos to Davie (Florida) | 2,256.77 mi (3,631.92 km) |
| San Marcos to Davis (California) | 453.23 mi (729.41 km) |
| San Marcos to Dayton (Nevada) | 443.60 mi (713.90 km) |
| San Marcos to Dayton (Ohio) | 1,877.58 mi (3,021.67 km) |
| San Marcos to Daytona Beach (Florida) | 2,139.59 mi (3,443.34 km) |
| San Marcos to De Pere (Wisconsin) | 1,737.96 mi (2,796.98 km) |
| San Marcos to De Witt (New York) | 2,311.46 mi (3,719.93 km) |
| San Marcos to Dearborn (Michigan) | 1,946.22 mi (3,132.14 km) |
| San Marcos to Dearborn Heights (Michigan) | 1,943.02 mi (3,126.99 km) |
| San Marcos to DeBary (Florida) | 2,132.90 mi (3,432.57 km) |
