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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Eureka. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Eureka, Illinois is approximatly 4871.
Racial profile for Eureka:
| White : | 4772 |
| Black : | 28 |
| Native American : | 18 |
| Asian : | 16 |
| Pacific Islander : | 0 |
| Other : | 8 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Eureka, Illinois :
| 18 - 19 : | 129 |
| 20 : | 73 |
| 21 : | 57 |
| 22 - 24 : | 99 |
| 25 - 29 : | 120 |
| 30 - 34 : | 111 |
| 35 - 39 : | 159 |
| 40 - 44 : | 158 |
| 45 - 49 : | 133 |
| 50 - 54 : | 122 |
| 55 - 59 : | 92 |
| 60 - 61 : | 30 |
| 62 - 64 : | 35 |
| 65 - 66 : | 25 |
| 67 - 69 : | 43 |
| 70 - 74 : | 61 |
| 75 - 79 : | 77 |
| 80 - 84 : | 63 |
| 85+ : | 73 |
Population by age for females in Eureka, Illinois :
| 18 - 19 : | 144 |
| 20 : | 51 |
| 21 : | 45 |
| 22 - 24 : | 110 |
| 25 - 29 : | 129 |
| 30 - 34 : | 127 |
| 35 - 39 : | 163 |
| 40 - 44 : | 158 |
| 45 - 49 : | 138 |
| 50 - 54 : | 112 |
| 55 - 59 : | 90 |
| 60 - 61 : | 29 |
| 62 - 64 : | 42 |
| 65 - 66 : | 31 |
| 67 - 69 : | 65 |
| 70 - 74 : | 93 |
| 75 - 79 : | 123 |
| 80 - 84 : | 137 |
| 85+ : | 238 |
The total amount of households in Eureka, Illinois is 1754. With 4321 people of the population in these households. The average household size is 2.46.
3650 people in Eureka, Illinois are part of a family. The average family size in Eureka is 3.12 people.
There are 898 married families in Eureka, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 130 | 3 - 4 : | 71 | 5 : | 44 | 6 - 11 : | 340 | 12 - 17 : | 313 |