Jefferson is located close to the center of Iowa. Jefferson is between the Greene, Guthrie county. Jefferson has 5.97 square miles of land area and 0.04 square miles of water area. As of 2010-2014, the total Jefferson population is 4,296, which has shrunk 7.13% since 2000. The population growth rate is much lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Jefferson median household income is $45,694 in 2010-2014 and has grown by 39.23% since 2000. The income growth rate is higher than the state average rate of 33.56% and is higher than the national average rate of 27.36%. Jefferson median house value is $85,600 in 2010-2014 and has grown by 45.33% since 2000. The house value growth rate is lower than the state average rate of 53.09% and is about the same as 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 Jefferson is much better than the state average in quality. The Jefferson area code is 515.