Population density (sq mi)2,19022891
Median age38.737.437.7
Male/Female ratio0.9:11.0:11.0:1
Married (15yrs & older)59%55%55%
Families w/ Kids under 1840%44%43%
Speak English98%77%79%
Speak Spanish2%13%13%

Key findings

  • The population density in Eureka is 860% higher than Illinois
  • The median age in Eureka is 3% higher than Illinois
  • In Eureka 96.43% of the population is White
  • In Eureka 0.79% of the population is Black
  • In Eureka 0.26% of the population is Asian

Compare Eureka, IL Demographics


      Eureka population breakdown by race

      American Indian0.00%0.23%0.82%
      Native Hawaiian0.00%0.03%0.18%
      Mixed race1.51%2.34%3.06%
      Other race1.01%5.86%4.75%
      In Eureka, 3.3% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Eureka age breakdown

      Marital status

      Age of children in married couples

      Source: The Eureka, IL demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).