post office in BWI?
 

I'm flying into BWI Friday morning on my way to the Grand Hyatt DC. Is there a post office in BWI from which I can get a postmark for that day? Alternatively, what's the most convenient post office to visit on the route from BWI to the hotel? I intend to travel on the DC metro as much as possible. TIA

I dont know BWI very well but not too far from your hotel and across the street from the DC Metro's Union Station is a post office and postal museum. Take the red line train and exit at Union Station through the Massachusetts Ave exit.

http://usps.whitepages.com/service/post_office/union-station-50-massachusetts-ave-ne-washington-dc-1442555

bwi has a bunch of mail boxes. they are shown on the terminal map. i have no idea as to pickup schedule.