Lopatcong Township is a township in Warren County, New Jersey, United States. As of the 2020 United States census, the township's population was 8,776, an increase of 762 (+9.5%) from the 2010 census count of 8,014, which in turn reflected an increase of 2,249 (+39.0%) from the 5,765 counted in the 2000 census.

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