426 miles
About 480-500 road miles.
It is 1,583 miles according to Google Maps.
The driving distance from Seattle WA to Mt. Rushmore National Memorial is about 1,183 road miles - approximately 18.5 hours driving time.
The driving distance is approximately 1,200 road miles.
Mt. Rushmore is on SD Highway 16.
About 970 road miles.
About 106 road miles.
About 1,020 road miles.
About 915 road miles.
About 1,080 road miles.
About 705 road miles.
The driving distance is 197 road miles.