Sergeantsville is a historic unincorporated community located within Delaware Township, in Hunterdon County, New Jersey, United States. Sergeantsville was first settled by a Mr. Thatcher in 1700, and was later named for Charles Sergeant, an American Revolutionary War soldier, in honor of the Sergeant family of which three brothers were local shopkeepers. "Out-of-towners give themselves away when they pronounce the first syllable 'sarge'; it's 'serge.'" Green Sergeant's Covered Bridge, constructed in 1872 across the Wickecheoke Creek, is located just west of Sergeantsville and is the oldest remaining covered bridge in New Jersey.