Eureka is located close to the center of Illinois. Eureka is part of Woodford County. Eureka has 3.02 square miles of land area and 0.05 square miles of water area. As of 2010-2014, the total Eureka population is 5,638, which has grown 15.75% since 2000. The population growth rate is much higher than the state average rate of 3.62% and is higher than the national average rate of 11.61%. Eureka median household income is $54,267 in 2010-2014 and has grown by 21.28% since 2000. The income growth rate is lower than the state average rate of 22.70% and is lower than the national average rate of 27.36%. Eureka median house value is $133,600 in 2010-2014 and has grown by 35.22% since 2000. The house value growth rate is about the same as 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 Eureka is much better than the state average in quality. The Eureka area code is 309.