Mountainside Hospital
Mountainside Hospital is a community hospital located in Glen Ridge, New Jersey. The hospital has 365 beds and serves Northeastern Essex County. On May 31, 2007, it was purchased by Merit Health Systems, a privately-owned for-profit Louisville, Kentucky hospital management company which acquires, owns and operates community hospitals. Mountainside Hospital is one of only two for-profit hospitals in New Jersey.

In the summer of 1890, Margaret Jane Merewether Power of Montclair came upon a small child who had fallen from a third story window, and was in need of serious medical attention. Upset at the fact that there was no nearby health care facility, Mrs. Power called upon other ladies in her social circle, and vowed to work toward a solution to the problem. In 1891, a three-story building was purchased and prepared to care for patients. Dr. John J.H. Love was named the first President of the Medical and Surgical Staff of "The Mountainside Hospital". The word "The" was later dropped from the hospital's formal name, making it simply "Mountainside Hospital".

Because Mountainside's mailing address is in Montclair, and because it is often said to be in Montclair (even on the hospital's official website), many people (including many hospital employees) erroneously believe that the hospital is physically located in Montclair. It is not. Mountainside Hospital is located entirely within Glen Ridge. However, a small portion (about 10%) of the adjacent Mountainside Hospital School of Nursing is in Montclair, as are most of the hospital's parking facilities.

In Popular culture
On the American television drama series The Sopranos, A.J. Soprano is placed in the psychiatric ward at Mountainside Hospital after he tries to drown himself in the family pool. Later, his father Tony Soprano gets a bill of $2,200 per day for warehousing his son at the mental health facility.