Johnson county is located in east Iowa. Johnson county has 614.04 square miles of land area and 9.11 square miles of water area. As of 2010, the total Johnson county population is 130,882, which has grown 17.91% since 2000. The population growth rate is much higher than the state average rate of 4.10% and is much higher than the national average rate of 9.71%. Johnson county median household income is $51,380 in 2006-2010 and has grown by 28.26% since 2000. The income growth rate is higher than the state average rate of 21.52% and is higher than the national average rate of 19.17%. Johnson county median house value is $177,000 in 2006-2010 and has grown by 34.60% since 2000. The house value growth rate is lower than the state average rate of 49.58% 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 Johnson county is much better than the state average in quality. The Johnson county area code is 319.
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