There are quite a few...Annandale in particular being the mini-Koreatown for the area.

Cho's Garden and Seoul House in Fairfax
http://www.washingtonpost.com/gog/re...n,1136655.html

http://www.washingtonpost.com/gog/re...e,1151293.html

Songbird and Woo Lae Oak at Tyson's
http://www.washingtonpost.com/gog/re...nt,976643.html

http://www.washingtonpost.com/gog/re...k,1119662.html

Gooldaegee, Wehgahjib, Han Gang in Annandale
http://www.washingtonpost.com/gog/re...ic-review.html

http://www.washingtonpost.com/gog/re...b,1142585.html

http://www.washingtonpost.com/gog/re...g,1156532.html


A search on the Wash Post or Washingtonian sites will reveal many more

http://www.washingtonpost.com/gog/dc-restaurants.html

http://www.washingtonian.com/RestaurantFinder.html