DC Preservation League
- Local historic preservation group. Includes newsletter, calendar and list of the most-endangered local sites.
- http://www.dcpreservation.org/

L'Enfant Trust
- Promotes Washington's historic architectural heritage through a program of conservation easements, educational programs, preservation assistance, and tree planting. Includes information about conservation easements and a list of properties on which easeme
- http://www.lenfant.org

Latrobe Chapter, Society of Architectural Historians
- Metropolitan Washington, DC, chapter of the national organization devoted to the study of architectural history. Includes membership and events information.
- http://architecture.cua.edu/latrobe/

Art Deco Society of Washington
- Supports the preservation of Art Deco architecture. Membership, events, preservation news, description and history.
- http://adsw.org/

AIA DC - The Washington Chapter of the American Institute of Architects
- Professional organization. Provides a directory of firms, job listings, calendar of events and membership information.
- http://www.aiadc.com/