The Mountain Lakes Free Public Library is located at Elm Road adjacent to the Post Office. The Library has over 40,000 books and over 3,000 audio/visual items. A major renovation was made in 1996 for better utilization of the existing space. In 2002 the Children’s Room was expanded. A large meeting room is in the lower floor of the building, specifically dedicated to and heavily used by community organizations. This room was renovated in 2006 to make it handicap accessible and a bathroom was added. A Borough archives room was also added. Through their library cards Mountain Lakes residents also have access to the M.A.I.N. (Morris Automated Information Network) system.