Irwin is located in west Pennsylvania. Irwin is between the Westmoreland, Allegheny county. Irwin has 0.84 square miles of land area and has no water area. As of 2010-2014, the total Irwin population is 3,924, which has shrunk 10.12% since 2000. The population growth rate is much lower than the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Irwin median household income is $41,967 in 2010-2014 and has grown by 28.11% since 2000. The income growth rate is lower than the state average rate of 32.44% and is about the same as the national average rate of 27.36%. Irwin median house value is $155,700 in 2010-2014 and has grown by 63.72% since 2000. The house value growth rate is lower than the state average rate of 70.00% and is higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Irwin is much better than the state average in quality. The Irwin area code is 724.