Irwin is located in Westmoreland county Pennsylvania with a geographic area of 0.8 square miles. The total population in Irwin is 3,773 with 50.1% male and 49.9% female. Children under age 5 represent 3.0% of the population, under age 18 equal 18.5% of the population and over age 65 is 18.0% of the population. The median household income is $49,766, per capita income is $32,582. There are a total of 2,081 housing units with 45.9% owner occupied. Education includes 27.2% of residents that are high school graduates and 32.1% with a bachelor's degree or higher. The average temperature in Irwin in the summer is 73 degrees, and in the winter 33 degrees.
