The Lake Ronkonkoma Historical Society’s mission is to celebrate and preserve the rich history of the Lake Ronkonkoma area. We operate two museums: The Lake Ronkonkoma Historical Society Museum founded in 1976 which is housed in what was once the Lake Ronkonkoma Free Library and the Fitz-Greene Hallock Homestead which is a 14-room home built in 1888 and is complete with all the original Hallock family furnishings. The Historical Society offers various tours and programs throughout the year.

Ann Farnum Curtis and a group of dedicated volunteers created the Lake Ronkonkoma Historical Society’s in 1976. The group’s mission was to preserve the history of the Lake Ronkonkoma area. Ann wrote and published a history of the area titled “Three Waves – The Story of Lake Ronkonkoma”, released in 1976, and decreed that all revenue from sales of the book forever to be used to support the organization. She then convinced the Sachem Public Library to lease the vacant 1916 Ronkonkoma Free Library building to her newly formed Historical Society.