Eureka, IL Profile: Facts, Map & Data


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Eureka, Illinois - Basic Facts

The City of Eureka had a population of 5,310 as of July 1, 2017. Eureka ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Eureka is located at latitude 40.714 and longitude -89.277 in Woodford County. The formal boundaries for the City of Eureka (see map below) encompass a land area of 2.67 sq. miles and a water area of 0.05 sq. miles. Woodford County is in the Central time zone (GMT -6). The elevation is 768 feet.

The City of Eureka (GNIS ID: 2394706) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Eureka is located within Township of Olio, a minor civil division (MCD) of Woodford County.

Beneath the boundary map are tables with Eureka population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Eureka, IL Boundary Map

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Boundary Maps: Township of Olio | Woodford County | Illinois Counties

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Eureka, IL Data & Demographics (As of July 1, 2017)


Total Population 5,310
Daytime Population: Workers 2,036
Daytime Population: Residents 2,958
Total Daytime Population (TDP) 4,994
Ratio TDP/Total Population1 0.94
Population in Households 4,767
Population in Familes 4,022
Population in Group Qrtrs 543
Population Density2 1,986
Diversity Index3 13


Median Household Income $52,815
Average Household Income $70,084
Per Capita Income $28,228


Total Housing Units 2,040 (100%)
Owner Occupied HU 1,320 (64.7%)
Renter Occupied HU 562 (27.5%)
Vacant Housing Units 158 ( 7.7%)
Median Home Value $142,239
Average Home Value $149,773


Total Households 1,882
Average Household Size 2.53
Family Households 1,293
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.28% 0.35%
Households 0.3% 0.35%
Families 0.53% 0.26%
Median Household Income   1.01%
Per Capita Income   2.16%

Eureka, IL - Peer Comparisons by Rank and Percentile

The table below compares Eureka to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 330 76th
Population Density # 278 80th
Diversity Index # 673 51st
Median Household Income # 710 48th
Per Capita Income # 551 60th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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