| Round Rock to Duluth (Minnesota) | 1,160.81 mi (1,868.15 km) |
| Round Rock to Dumas (Texas) | 444.46 mi (715.28 km) |
| Round Rock to Dumont (New Jersey) | 1,503.21 mi (2,419.19 km) |
| Round Rock to Duncan (Oklahoma) | 277.73 mi (446.96 km) |
| Round Rock to Duncanville (Texas) | 152.94 mi (246.14 km) |
| Round Rock to Dundalk (Maryland) | 1,338.60 mi (2,154.26 km) |
| Round Rock to Dunedin (Florida) | 912.32 mi (1,468.23 km) |
| Round Rock to Dunkirk (New York) | 1,305.96 mi (2,101.74 km) |
| Round Rock to Dunmore (Pennsylvania) | 1,438.34 mi (2,314.78 km) |
| Round Rock to Dunwoody (Georgia) | 814.51 mi (1,310.83 km) |
| Round Rock to Durango (Colorado) | 747.47 mi (1,202.94 km) |
| Round Rock to Durant (Oklahoma) | 250.86 mi (403.72 km) |
| Round Rock to Durham (North Carolina) | 1,145.38 mi (1,843.31 km) |
| Round Rock to Dyer (Indiana) | 945.44 mi (1,521.53 km) |
| Round Rock to Dyersburg (Tennessee) | 611.53 mi (984.17 km) |
