Gardiner is located in southwest Maine. Gardiner is part of Kennebec County. Gardiner has 15.65 square miles of land area and 0.92 square miles of water area. As of 2010-2014, the total Gardiner population is 5,737, which has shrunk 7.44% since 2000. The population growth rate is much lower than the state average rate of 4.21% and is much lower than the national average rate of 11.61%. Gardiner median household income is $46,400 in 2010-2014 and has grown by 32.18% since 2000. The income growth rate is about the same as the state average rate of 31.05% and is higher than the national average rate of 27.36%. Gardiner median house value is $136,300 in 2010-2014 and has grown by 77.24% since 2000. The house value growth rate is about the same as the state average rate of 75.89% and is much 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 Gardiner is close to the state average in quality. The Gardiner area code is 207.