LaSalle County, Illinois Age & Gender Statistics (2024)

Total Population

108,714

Median Age

42.2

Male Median

40.7

Female Median

43.4

LaSalle County, Illinois Population Growth

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

LaSalle County, Illinois Demographic Trend

Since 2010, the population of has changed by -4.5%%.

-4.5%% Growth

LaSalle County, Illinois Age & Gender Pyramid

Population pyramid for

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


LaSalle County, Illinois Historical Population Data

YearMedian AgePopulation
202442.2108,714
202342.1109,049
202241.9109,495
202141.8109,986
202042.1108,998
201941.9109,737
201841.8110,401
201741.8111,151
201641.8111,935
201541.6112,579
201441.6112,698
201341.3113,295
201241.1113,688
201140.9113,865
201040.5113,789

LaSalle County, Illinois Age Group Breakdown (2024)

Age CohortPercentage
Under 55.2%
5–1716.0%
18–247.9%
25–3412.0%
35–5424.4%
55–6414.6%
65+19.9%

Dependency Ratios for LaSalle County, Illinois

Total Dependency Ratio:
69.8
Youth Dependency:
36.0
Old-Age Dependency:
33.8

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



Age & Gender FAQs for LaSalle County, Illinois

The median age in LaSalle County, Illinois is 42.2 years.

According to latest Census data, the total population of LaSalle County, Illinois is 108,714.

In LaSalle County, Illinois, seniors (ages 65+) make up 19.9% of the population, while children under 18 represent 16.0%.

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