Arlington is located in northwest Washington. Arlington is part of Snohomish County. Arlington has 9.25 square miles of land area and 0.01 square miles of water area. As of 2010-2014, the total Arlington population is 18,370, which has grown 56.83% 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%. Arlington median household income is $61,131 in 2010-2014 and has grown by 32.03% 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%. Arlington median house value is $225,800 in 2010-2014 and has grown by 29.18% 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 Arlington is better than the state average in quality. The Arlington area code is 360.