| San Marcos to Des Plaines (Illinois) | 1,706.36 mi (2,746.12 km) |
| San Marcos to Desert Hot Springs (California) | 67.32 mi (108.34 km) |
| San Marcos to DeSoto (Texas) | 1,177.46 mi (1,894.94 km) |
| San Marcos to Destin (Florida) | 1,807.16 mi (2,908.34 km) |
| San Marcos to Destrehan (Louisiana) | 1,589.16 mi (2,557.50 km) |
| San Marcos to Detroit (Michigan) | 1,952.48 mi (3,142.21 km) |
| San Marcos to Diamond Bar (California) | 70.22 mi (113.00 km) |
| San Marcos to Diamond Springs (California) | 435.18 mi (700.36 km) |
| San Marcos to Dickinson (North Dakota) | 1,213.55 mi (1,953.02 km) |
| San Marcos to Dickinson (Texas) | 1,327.60 mi (2,136.56 km) |
| San Marcos to Dickson (Tennessee) | 1,700.64 mi (2,736.91 km) |
| San Marcos to Difficult Run (Virginia) | 2,242.98 mi (3,609.73 km) |
| San Marcos to Dinuba (California) | 267.25 mi (430.09 km) |
| San Marcos to Discovery Bay (California) | 412.91 mi (664.51 km) |
| San Marcos to Dix Hills (New York) | 2,450.81 mi (3,944.20 km) |
