Merrillville is located in northwest Indiana. Merrillville is part of Lake County. Merrillville has 33.22 square miles of land area and 0.04 square miles of water area. As of 2010-2014, the total Merrillville population is 35,262, which has grown 15.39% since 2000. The population growth rate is much higher than the state average rate of 7.60% and is higher than the national average rate of 11.61%. Merrillville median household income is $49,711 in 2010-2014 and has grown by 0.34% since 2000. The income growth rate is much lower than the state average rate of 17.25% and is much lower than the national average rate of 27.36%. Merrillville median house value is $127,600 in 2010-2014 and has grown by 25.96% since 2000. The house value growth rate is lower than the state average rate of 30.12% 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 Merrillville is worse than the state average in quality. The Merrillville area code is 219.