Randolph is a township in Morris County, New Jersey, United States and is part of the New York Metropolitan Area. As of the 2010 United States Census, the township's population was 25,734, reflecting an increase of 887 (+3.6%) from the 24,847 counted in the 2000 Census, which had in turn increased by 4,873 (+24.4%) from the 19,974 counted in the 1990 Census.