Boone County, Illinois Age & Gender Statistics (2024)

Total Population

53,230

Median Age

39.7

Male Median

39.2

Female Median

40.2

Boone County, Illinois Population Growth

Population trends in
Figure 1: Annual population growth trend for (2010–2024).

Boone County, Illinois Demographic Trend

Since 2010, the population of has changed by -0.6%%.

-0.6%% Growth

Boone County, Illinois Age & Gender Pyramid

Population pyramid for

Figure 2: Population distribution by age and gender for 2024.


Boone County, Illinois Historical Population Data

YearMedian AgePopulation
202439.753,230
202339.553,316
202239.053,459
202138.853,592
202038.753,293
201938.553,537
201838.453,606
201738.353,638
201638.353,656
201538.253,851
201438.154,005
201337.354,068
201236.654,141
201136.054,084
201035.853,567

Boone County, Illinois Age Group Breakdown (2024)

Age CohortPercentage
Under 55.1%
5–1718.7%
18–249.2%
25–3411.2%
35–5425.8%
55–6413.3%
65+16.7%

Dependency Ratios for Boone County, Illinois

Total Dependency Ratio:
68.1
Youth Dependency:
40.0
Old-Age Dependency:
28.2

The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).



Age & Gender FAQs for Boone County, Illinois

The median age in Boone County, Illinois is 39.7 years.

According to latest Census data, the total population of Boone County, Illinois is 53,230.

In Boone County, Illinois, seniors (ages 65+) make up 16.7% of the population, while children under 18 represent 18.7%.

Based on historical data since 2010, the population in Boone County, Illinois is aging.
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