http://columbiabuyu.com/ This school is in Columbia, Maryland. I trained there for a two months spand last summer. They are really nice. They are more of a wim of the moment club, rather than a structured school.
There is a school called the C.A.I.N Institute. They teach various styles of ninjitsu. Their website does not respond. But the school is located near me... Virginia Beach, Va. Might be too far for you. I do not have a number for you, sorry!
Where in Va/Md? Check out http://www.yume-dojo.org. Lots of high quality instruction here in MD. And soon to be more.