Fairfax is located in southeast South Dakota. Fairfax is part of Gregory County. Fairfax has 0.30 square miles of land area and has no water area. As of 2010-2014, the total Fairfax population is 100, which has shrunk 18.70% since 2000. The population growth rate is much lower than the state average rate of 10.58% and is much lower than the national average rate of 11.61%. Fairfax median household income is $26,389 in 2010-2014 and has grown by 32.98% since 2000. The income growth rate is lower than the state average rate of 42.67% and is higher than the national average rate of 27.36%. Fairfax median house value is $45,000 in 2010-2014 and has grown by 200.00% since 2000. The house value growth rate is much higher than the state average rate of 70.48% 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 Fairfax is much better than the state average in quality. The Fairfax area code is 605.