Gardner is located in northwest Massachusetts. Gardner is part of Worcester County. Gardner has 22.08 square miles of land area and 0.94 square miles of water area. As of 2010-2014, the total Gardner population is 20,279, which has shrunk 2.36% since 2000. The population growth rate is much lower than the state average rate of 4.85% and is much lower than the national average rate of 11.61%. Gardner median household income is $46,589 in 2010-2014 and has grown by 24.79% since 2000. The income growth rate is lower than the state average rate of 34.34% and is lower than the national average rate of 27.36%. Gardner median house value is $174,400 in 2010-2014 and has grown by 64.06% since 2000. The house value growth rate is lower than the state average rate of 77.65% 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 Gardner is worse than the state average in quality. The Gardner area code is 978.