Marshall county is located close to the center of Illinois. Marshall county has 386.79 square miles of land area and 11.73 square miles of water area. As of 2010-2014, the total Marshall county population is 12,319, which has shrunk 6.53% 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%. Marshall county median household income is $53,914 in 2010-2014 and has grown by 29.68% since 2000. The income growth rate is higher than the state average rate of 22.70% and is higher than the national average rate of 27.36%. Marshall county median house value is $103,200 in 2010-2014 and has grown by 35.97% since 2000. The house value growth rate is about the same as the state average rate of 34.33% 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 Marshall county is better than the state average in quality. The Marshall county area codes are 309, 815.
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