Originally Posted by
choster
There is an Avis right inside Union Station, no need to go downtown. There's also an Alamo/National.
I thought there was one too but when I used google to try to find it quickly I couldn't and so edited that out.
Should have gone direct to Avis.com:
Washington Union Train Station - US1
50 Massachusetts Ave NE, Washington, DC 20002 , U S A
(1) 202-682-2983
Sun 12:00PM-08:00PM; Mon-Fri 08:00AM-09:00PM; Sat 07:00AM-03:00PM