Mattawa is located close to the center of Washington. Mattawa is part of Grant County. Mattawa has 0.74 square miles of land area and has no water area. As of 2010-2014, the total Mattawa population is 4,502, which has grown 72.56% since 2000. The population growth rate is much higher than the state average rate of 17.05% and is much higher than the national average rate of 11.61%. Mattawa median household income is $42,212 in 2010-2014 and has grown by 32.06% since 2000. The income growth rate is about the same as the state average rate of 31.72% and is higher than the national average rate of 27.36%. Mattawa median house value is $83,000 in 2010-2014 and has grown by -4.60% since 2000. The house value growth rate is much lower than the state average rate of 52.82% and is much 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 Mattawa is worse than the state average in quality. The Mattawa area code is 509.