| San Marcos to Duluth (Minnesota) | 1,615.19 mi (2,599.40 km) |
| San Marcos to Dumas (Texas) | 885.36 mi (1,424.85 km) |
| San Marcos to Dumont (New Jersey) | 2,416.34 mi (3,888.73 km) |
| San Marcos to Duncan (Oklahoma) | 1,107.50 mi (1,782.34 km) |
| San Marcos to Duncanville (Texas) | 1,174.20 mi (1,889.69 km) |
| San Marcos to Dundalk (Maryland) | 2,287.68 mi (3,681.67 km) |
| San Marcos to Dunedin (Florida) | 2,066.19 mi (3,325.21 km) |
| San Marcos to Dunkirk (New York) | 2,144.29 mi (3,450.91 km) |
| San Marcos to Dunmore (Pennsylvania) | 2,332.14 mi (3,753.21 km) |
| San Marcos to Dunwoody (Georgia) | 1,885.24 mi (3,033.99 km) |
| San Marcos to Durango (Colorado) | 597.02 mi (960.81 km) |
| San Marcos to Durant (Oklahoma) | 1,195.90 mi (1,924.62 km) |
| San Marcos to Durham (North Carolina) | 2,172.73 mi (3,496.67 km) |
| San Marcos to Dyer (Indiana) | 1,719.31 mi (2,766.96 km) |
| San Marcos to Dyersburg (Tennessee) | 1,588.36 mi (2,556.22 km) |
