Eastham Chamber of Commerce P.O. Box 1329, Eastham, MA 02642, 508-240-7211, This organization provides visitor and relocation information relating to the Eastham and Cape Cod region.

Eastham Historical Society P.O. Box 8, Eastham, MA 02642, 508-255-4956, This organization preserves and provides information regarding the rich history and culture of Eastham and its Cape Cod heritage.

Friends of the Cape Cod National Seashore P.O. Box 550, Eastham, MA 02667, Wellfleet, 508-349-3785 x402, A nonprofit organization, Friends of the Cape Cod National Seashore is dedicated to the history and preservation of this unique and beautiful National Park.  more...