Annandale is an unincorporated community and census-designated place (CDP) located within Clinton Township, in Hunterdon County, in the U.S. state of New Jersey. As of the 2010 United States Census, the CDP's population was 1,695. The Annandale Historic District was listed on the state and national registers of historic places in 1994.

Clinton Township is a township in Hunterdon County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 13,505, an increase of 27 (+0.2%) from the 2010 census count of 13,478, which in turn reflected an increase of 521 (+4.0%) from the 12,957 counted in the 2000 census.