Rock Island, WA
Rock Island is located close to the center of Washington. Rock Island is part of Douglas County. Rock Island has 0.61 square miles of land area and 0.14 square miles of water area. As of 2010-2014, the total Rock Island population is 874, which has grown 1.27% since 2000. The population growth rate is much lower than the state average rate of 17.05% and is much lower than the national average rate of 11.61%. Rock Island median household income is $42,500 in 2010-2014 and has grown by 26.42% since 2000. The income growth rate is lower than the state average rate of 31.72% and is about the same as the national average rate of 27.36%. Rock Island median house value is $151,500 in 2010-2014 and has grown by 59.14% since 2000. The house value growth rate is higher than the state average rate of 52.82% 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 Rock Island is close to the state average in quality. The Rock Island area code is 509.