Irwin is located in west Iowa. Irwin is part of Shelby County. Irwin has 0.60 square miles of land area and has no water area. As of 2010-2014, the total Irwin population is 435, which has grown 16.94% since 2000. The population growth rate is much higher than the state average rate of 5.19% and is much higher than the national average rate of 11.61%. Irwin median household income is $41,406 in 2010-2014 and has grown by 36.13% since 2000. The income growth rate is higher than the state average rate of 33.56% and is higher than the national average rate of 27.36%. Irwin median house value is $55,800 in 2010-2014 and has grown by 31.29% since 2000. The house value growth rate is much lower than the state average rate of 53.09% and is lower 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 712.