It is made up of the southern and central New Jersey counties of Union, Middlesex, Somerset, Hunterdon, Mercer, Monmouth, Ocean, Burlington, Camden, Atlantic, Gloucester, Salem, Cumberland, and Cape May.

Services began in 1685 at St. Peter's, Perth Amboy, the oldest parish in the diocese.

The diocese is under the jurisdiction of Sally French, Bishop of New Jersey, whose seat is at Trinity Cathedral, Trenton.

The largest parish in the diocese is Trinity Church, Princeton.

[3] Diocesan House, which holds the administrative offices of the diocese sits across the street in a converted Victorian home and adjacent casino built in 1912 and 1927 respectively.