West Long Branch is a borough situated within the Jersey Shore region, within Monmouth County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 8,587, its highest decennial count ever and an increase of 490 (+6.1%) from the 2010 census count of 8,097, which in turn reflected reflected a decline of 161 (−1.9%) from the 8,258 counted in the 2000 census. West Long Branch is the home of Monmouth University.

Monmouth County is a county, located in the central section of the U.S. state of New Jersey. Comprising much of the northern half of the Jersey Shore, it is bordered to its west by Mercer and Middlesex Counties, to its south by Ocean County, to its east by the Atlantic Ocean, and to its north by the Raritan Bay. Monmouth County's geographic area comprises 30% water. The county is considered part of the Central Jersey region of the state, though it was not among the four counties explicitly listed as included in Central Jersey as part of legislation signed into law in 2023.