Delaware county is located in east Iowa. Delaware county has 577.76 square miles of land area and 1.19 square miles of water area. As of 2010, the total Delaware county population is 17,764, which has shrunk 3.48% 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%. Delaware county median household income is $47,078 in 2006-2010 and has grown by 26.66% 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%. Delaware county median house value is $113,700 in 2006-2010 and has grown by 42.66% 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 Delaware county is much better than the state average in quality. The Delaware county area codes are 319, 563.
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