Middletown is located in southeast Iowa. Middletown is part of Des Moines County. Middletown has 0.61 square miles of land area and has no water area. As of 2010-2014, the total Middletown population is 302, which has shrunk 43.55% since 2000. The population growth rate is much lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Middletown median household income is $52,917 in 2010-2014 and has grown by 42.70% since 2000. The income growth rate is higher than the state average rate of 33.56% and is much higher than the national average rate of 27.36%. Middletown median house value is $102,500 in 2010-2014 and has grown by 57.69% since 2000. The house value growth rate is higher than the state average rate of 53.09% and is higher 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 Middletown is much better than the state average in quality. The Middletown area code is 319.