City of Washington D.C. 1350 Pennsylvania Avenue Northwest, Washington, DC 20004, Located in the John A. Wilson Building, 202-727-1000, Provides information on local city services and local government offices in the Washington D.C. area. more... 

DC Chamber of Commerce 1213 K Street Northwest, Washington, DC 20005, 202-347-7201, Promotes and supports local businesses and industries in the Washington, D.C., area plus provides relocation information.

Washington DC Convention and Visitors Association 1212 New York Avenue Northwest, #600, Washington, DC 20005, 202-789-7000, 800-635-6338, Provides information on local lodging, dining, attractions, entertainment, and shopping in the Washington DC area. more... 

Arts Club of Washington 2017 I Street Northwest, Washington, DC 20006, 202-331-7282, Founded in 1916, this arts club is the oldest nonprofit arts organization in the city and they support a variety of styles and mediums.  more... 

Cultural Tourism DC 1250 H Street Northwest, Suite 1000, Washington, DC 20005, 202-661-781, A grassroots, nonprofit coalition of over 130 arts, heritage, cultural, and community organizations throughout Washington, DC, that promotes economic development and hometown appreciation of the capital's rich variety of heritage and arts attractions.  more... 

National Endowment for the Arts 1100 Pennsylvania Avenue Northwest, Washington, DC 20506, 202-682-5400, The National Endowment for the Arts enriches the nation and its cultural heritage by supporting works of artistic excellence and strengthening the arts in communities throughout the United States. 

Parks & History Association 126 Raleigh Street Southeast, Washington, DC 20032, 202-472-3083, A not-for-profit organization that operates bookshops at National Park Service locations and offers a variety of theme-related, site specific publications, merchandise, and educational products for young and old. more...