The Middlesex Free Public Library was established in 1962 by public referendum. The original building, opened in 1963, was a converted barber shop and housed 100 reference books. In 1964 the library moved to larger quarters at the Mountain View Park because of the rapid growth of books and services to the public. This location was to serve as temporary headquarters until a suitable building was erected.
In 1965 the Board of Trustees began plans for a new library to serve the growing population. The plan of the Board was defeated by a public referendum in 1968. A committee appointed by the Mayor studied alternate plans and recommendations. The committee report provided for a library building of 7,500 square feet to be erected on Mountain Avenue next to the Borough Hall. Ground breaking ceremonies were held in December, 1969. The building opened in December, 1970.