Oak Ridge is an unincorporated community and census-designated place (CDP) located along the border of West Milford Township in Passaic County and Jefferson Township in Morris County, in the U.S. state of New Jersey. The area is served as United States Postal Service ZIP Code 07438.

Jefferson Township is the northernmost township in Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 20,538, a decrease of 776 (−3.6%) from the 2010 census count of 21,314, which in turn reflected an increase of 1,597 (+8.1%) from the 19,717 counted in the 2000 census.