South plainfield is located in Middlesex county New jersey with a geographic area of 8.3 square miles. The total population in South plainfield is 23,961 with 50.2% male and 49.8% female. Children under age 5 represent 5.9% of the population, under age 18 equal 20.3% of the population and over age 65 is 18.3% of the population. The median household income is $108,244, per capita income is $40,875. There are a total of 8,198 housing units with 86.2% owner occupied. Education includes 25.9% of residents that are high school graduates and 43.3% with a bachelor's degree or higher. The average temperature in South plainfield in the summer is 73 degrees, and in the winter 34 degrees.
