Somonauk is located in north Illinois. Somonauk is between the Dekalb, La Salle county. Somonauk has 2.41 square miles of land area and 0.01 square miles of water area. As of 2010-2014, the total Somonauk population is 2,191, which has grown 69.19% since 2000. The population growth rate is much higher than the state average rate of 3.62% and is much higher than the national average rate of 11.61%. Somonauk median household income is $60,250 in 2010-2014 and has grown by 32.80% since 2000. The income growth rate is higher than the state average rate of 22.70% and is higher than the national average rate of 27.36%. Somonauk median house value is $164,800 in 2010-2014 and has grown by 32.05% since 2000. The house value growth rate is lower than the state average rate of 34.33% and is 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 Somonauk is better than the state average in quality. The Somonauk area code is 815.