South Orange is a township in Essex County, New Jersey, United States. As of the 2010 United States Census, the village's population was 16,198, reflecting a decline of 766 (-4.5%) from the 16,964 counted in the 2000 Census, which had in turn increased by 574 (+3.5%) from the 16,390 counted in the 1990 Census. Seton Hall University is located in the township.