KNOWPIA
WELCOME TO KNOWPIA
Category:Organizations based in Washington, D.C. 
Summary
Wikimedia Commons has media related to Organizations in Washington, D.C..
This category includes articles on organizations based in Washington, D.C., the capital of the United States. Organizations include, among others, voluntary associations and 501(c) non-profit organizations; companies and for-profit organizations, religious organizations, and so on, are also appropriate.