Beverly,
The July 2004 issue of Essence (w/ Mo'Nique) lists 50 hair colorists and salons to dye for: There are three in the metro area.
1. Abada Hair Studio, Amani Mujiheed, Temple Hills, MD; (301)423-0770
14. Hairs to You, Safi Taylor, Baltimore; (410)521-2526
43. Strands Hair Studio (which Karonica mentioned above), Shirley Gordon or Kim Whitehurst, Wheaton, MD; (301) 942-1780