Vandalia is located in south Illinois. Vandalia is part of Fayette County. Vandalia has 8.10 square miles of land area and 0.02 square miles of water area. As of 2010-2014, the total Vandalia population is 6,247, which has shrunk 10.44% since 2000. The population growth rate is much lower than the state average rate of 3.62% and is much lower than the national average rate of 11.61%. Vandalia median household income is $44,107 in 2010-2014 and has grown by 42.94% since 2000. The income growth rate is much higher than the state average rate of 22.70% and is much higher than the national average rate of 27.36%. Vandalia median house value is $78,200 in 2010-2014 and has grown by 29.68% since 2000. The house value growth rate is lower than the state average rate of 34.33% and is much 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 Vandalia is worse than the state average in quality. The Vandalia area code is 618.