Annandale is a census-designated place and unincorporated area located within Clinton Township, in Hunterdon County, New Jersey. As of the United States 2000 Census, the CDP population was 1,276. Annandale is the location of North Hunterdon High School.
Annandale is located at 40°38′32″N 74°53′05″W / 40.642346°N 74.884623°W / 40.642346; -74.884623 (40.642346, -74.884623).
According to the United States Census Bureau, the CDP has a total area of 3.8 km2 (1.5 mi2), all land.