Clayton county is located in east Iowa. Clayton county has 778.54 square miles of land area and 14.13 square miles of water area. As of 2010, the total Clayton county population is 18,129, which has shrunk 2.94% since 2000. The population growth rate is much lower than the state average rate of 4.10% and is much lower than the national average rate of 9.71%. Clayton county median household income is $45,873 in 2006-2010 and has grown by 34.65% since 2000. The income growth rate is much higher than the state average rate of 21.52% and is much higher than the national average rate of 19.17%. Clayton county median house value is $96,500 in 2006-2010 and has grown by 45.33% 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 Clayton county is much better than the state average in quality. The Clayton county area codes are 319, 563.
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