Jefferson county is located in south Illinois. Jefferson county has 571.17 square miles of land area and 12.62 square miles of water area. As of 2010, the total Jefferson county population is 38,827, which has shrunk 3.04% since 2000. The population growth rate is much lower than the state average rate of 3.31% and is much lower than the national average rate of 9.71%. Jefferson county median household income is $41,161 in 2006-2010 and has grown by 22.67% since 2000. The income growth rate is much higher than the state average rate of 13.70% and is higher than the national average rate of 19.17%. Jefferson county median house value is $85,800 in 2006-2010 and has grown by 34.48% since 2000. The house value growth rate is lower than the state average rate of 46.64% and is lower than the national average rate of 50.42%. 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 Jefferson county is worse than the state average in quality. The Jefferson county area code is 618.
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