Johnston is located in Providence county Rhode island with a geographic area of square miles. The total population in Johnston is 29,326 with 48.3% male and 51.7% female. Children under age 5 represent 4.2% of the population, under age 18 equal 17.3% of the population and over age 65 is 21.3% of the population. The median household income is $68,859, per capita income is $35,108. There are a total of 11,531 housing units with 70.7% owner occupied. Education includes 39.2% of residents that are high school graduates and 27.0% with a bachelor's degree or higher. The average temperature in Johnston in the summer is 69 degrees, and in the winter 33 degrees.
