Middletown is located in northwest California. Middletown is part of Lake County. Middletown has 1.84 square miles of land area and has no water area. As of 2010-2014, the total Middletown population is 1,073, which has grown 5.20% since 2000. The population growth rate is much lower than the state average rate of 12.39% and is much lower than the national average rate of 11.61%. Middletown median household income is $48,965 in 2010-2014 and has grown by 38.80% since 2000. The income growth rate is higher than the state average rate of 29.47% and is higher than the national average rate of 27.36%. Middletown median house value is $279,700 in 2010-2014 and has grown by 118.86% since 2000. The house value growth rate is much higher than the state average rate of 75.60% and is much 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 close to the state average in quality. The Middletown area code is 707.