Local 

Metropolitan Washington Chapter of the World Future Society.

The chapter was re-formed in 1992 to support the education and professional objectives of the World Future Society   

Global 

A good place to start..
 Futures Organizations and Commissions An insightful and useful list produced by Roger Caldwell at the University of Arizona

Copenhagen Institute for Futures Studies. The Copenhagen Institute for Futures Studies was founded in 1970 by Professor Thorkil Kristensen, former Minister of Finance and Secretary-General of the OECD. It was set up in cooperation with a number of visionary organizations wanting to qualify their basis for making decisions through futures studies.

Futures Institute Rio Salado College, Thomas Lombardo Ph.D.  Director Futures Institute of Rio Salado College, Tempe, Arizona. The institute is made up of teachers and educators of the future, who  believe that futures education should be the central concern of all education. Their educational approach to the future is multi-disciplinary, integrative, and evolutionary.

Hawaii Research Center for Futures Studies University of Hawaii at Manoa. HRCFS  was created by the Hawaii State Legislature in 1971. 

List of "Other People's Links to Futures Sites"   An useful list produced by Roger Caldwell at the University of Arizona

Social Science Research Institute at the University of Hawaii at Manoa, it serves as a futures research arm for public agencies, private groups, and individuals who require assistance in locating future-oriented information or experts. 

Institute for the Future.  IFTF is an independent, non-profit research firm specializing in long-term forecasting. The business was founded in 1968 by an Advisory Council of distinguished researchers and research managers with a grant from the Ford Foundation and active interest and support from the following notable organizations 

WORLD FUTURE SOCIETY is a nonprofit educational and scientific organization for people interested in how social and technological developments are shaping the future.