Uber's reliable coverage area in Washington, D.C. includes the entirety of the District and Arlington, as well as most of Alexandria, Chevy Chase, McLean, and Bethesda. You can check coverage for your specific location here: http://uber.com/dc 

After being picked up, your driver will always be happy to take you anywhere you would like to go, whether it's within the Uber pickup area or not. Have a great ride!