Washington is located in southeast Iowa. Washington is part of Washington County. Washington has 4.92 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Washington population is 7,315, which has grown 3.80% since 2000. The population growth rate is lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Washington median household income is $48,708 in 2010-2014 and has grown by 35.05% since 2000. The income growth rate is about the same as the state average rate of 33.56% and is higher than the national average rate of 27.36%. Washington median house value is $104,900 in 2010-2014 and has grown by 32.45% since 2000. The house value growth rate is much lower than the state average rate of 53.09% and is lower 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 Washington is much better than the state average in quality. The Washington area code is 319.