| San Marcos to Decatur (Alabama) | 1,728.34 mi (2,781.50 km) |
| San Marcos to Decatur (Georgia) | 1,887.74 mi (3,038.02 km) |
| San Marcos to Decatur (Illinois) | 1,628.11 mi (2,620.19 km) |
| San Marcos to Deer Park (New York) | 2,451.73 mi (3,945.67 km) |
| San Marcos to Deer Park (Texas) | 1,319.78 mi (2,123.99 km) |
| San Marcos to Deerfield (Illinois) | 1,710.65 mi (2,753.02 km) |
| San Marcos to Deerfield Beach (Florida) | 2,260.33 mi (3,637.65 km) |
| San Marcos to Defiance (Ohio) | 1,878.35 mi (3,022.91 km) |
| San Marcos to DeForest (Wisconsin) | 1,654.37 mi (2,662.44 km) |
| San Marcos to DeKalb (Illinois) | 1,662.30 mi (2,675.22 km) |
| San Marcos to Del Aire (California) | 87.49 mi (140.80 km) |
| San Marcos to Del City (Oklahoma) | 1,135.80 mi (1,827.89 km) |
| San Marcos to Del Rio (Texas) | 995.77 mi (1,602.54 km) |
| San Marcos to DeLand (Florida) | 2,132.17 mi (3,431.39 km) |
| San Marcos to Delano (California) | 217.29 mi (349.69 km) |
