What is the closest DC Metro station or Bus to McLEan, VA from Union Square?
Not sure about Union Square – I will assume you mean Union Station. There is no long distance bus to McLean. The Bus Station, if you are taking Greyhound (which actually does not leave from Penn Station – Penn Station is Amtrak) is a bit north of Union Station in DC (though there are other buses that might stop at Union Station – I may not be available.) The best Metro Station for McLean is West Falls Church, which is in Falls Church, but only a couple of miles from McLean. You should be able to either take a metro bus or a cab from there. If you are arriving in or near Union Station, take the Red Line to Metro Center, then switch to the Orange Line toward Vienna to West Falls Church. I’ll add Metro’s web address, so that you can figure out local buses from West Falls Church to Mclean.