oak ridge is what county
Oak Ridge, New Jersey Oak Ridge is an unincorporated community located along the border of West Milford Township in Passaic County and Jefferson Township in Morris County, New Jersey, United States. The area is served as United States Postal Service ZIP Code 07438. The Headley family was the first family to settle in Oak Ridge (Jefferson). As of the 2000 United States Census, the population for ZIP Code Tabulation Area 07438 was 11,901.