3000 miles. This is the route: <br /><ol><li>Take U.S. 101 SOUTH to U.S. 26 EAST to PORTLAND.</li><li>EXIT off onto U.S. 26 EAST. Take U.S. 26 EAST to U.S. 26 EAST/I-405 SOUTH in downtown Portland.</li><li>Take I-405/U.S. 26 to I-84 EAST towards THE DALLES. Follow signs.</li><li>Take I-84 EAST all the way across to I-80 EAST to CHEYENNE at END I-84 in Utah.</li><li>Take I-80 EAST all the way across to I-76 EAST to the Pennsylvania TURNPIKE to PITTSBURGH in Ohio on the OHIO TURNPIKE (toll). Continue STRAIGHT on I-76 EAST.</li><li>Take I-76 EAST to U.S. 30 EAST TO I-70 EAST to BREEZEWOOD and BALTIMORE in Pennsylvania. FOLLOW SIGNS to I-70 EAST.</li><li>Take I-70 EAST to I-270 SOUTH to WASHINGTON at EXIT 53 in Maryland.</li><li>Take I-270 SOUTH to Washington, D.C.</li></ol>
The driving distance from Washington, District of Columbia to Warrenton, Virginia is:47 miles / 75 kmtravelmath dot com provided this answer
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