Headquarters is an unincorporated community located within the Amwell Valley of Delaware Township in Hunterdon County, New Jersey. The settlement is centered around the intersection of Zentek Road and County Route 604. It is about 3 miles from Ringoes to the east and 1 mile from Sergeantsville to the west. The Headquarters Historic District was listed on the state and national registers of historic places in 2011 and had its boundary increased in 2016.