Brielle is a Borough located in southern Monmouth County, New Jersey along the Manasquan River. As of the 2010 United States Census, the borough population was 4,774.
Brielle was formed as a borough by an Act of the New Jersey Legislature on April 10, 1919, from portions of Wall Township, based on the results of a referendum passed on June 3, 1919.
Brielle is bordered to the north and east by the borough of Manasquan, to the west by Wall Township and to the south by the borough of Point Pleasant Beach across the Manasquan River. Route 35 runs through the middle of the town and Route 70 runs along its western edge. Its geographic coordinates are 40°06′30″N 74°03′44″W / 40.108433°N 74.062222°W / 40.108433; -74.062222 (40.108433, -74.062222).