Plainfield is located in Union county New jersey with a geographic area of 6.0 square miles. The total population in Plainfield is 50,252 with 51.5% male and 48.5% female. Children under age 5 represent 7.8% of the population, under age 18 equal 27.2% of the population and over age 65 is 11.7% of the population. The median household income is $58,400, per capita income is $25,647. There are a total of 15,626 housing units with 43.4% owner occupied. Education includes 32.4% of residents that are high school graduates and 23.6% with a bachelor's degree or higher. The average temperature in Plainfield in the summer is 73 degrees, and in the winter 33 degrees.
