Marion County, Missouri Age & Gender Statistics (2024)

Total Population

28,457

Median Age

39.6

Male Median

38.3

Female Median

40.4

Marion County, Missouri Population Growth

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

Marion County, Missouri Demographic Trend

Since 2010, the population of has changed by -0.4%%.

-0.4%% Growth

Marion County, Missouri Age & Gender Pyramid

Population pyramid for

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


Marion County, Missouri Historical Population Data

YearMedian AgePopulation
202439.628,457
202339.428,493
202239.028,525
202139.228,564
202038.928,572
201938.928,608
201839.128,672
201739.228,703
201639.428,858
201539.728,840
201439.728,844
201339.528,804
201239.328,703
201138.728,623
201038.628,579

Marion County, Missouri Age Group Breakdown (2024)

Age CohortPercentage
Under 57.1%
5–1716.9%
18–248.8%
25–3411.6%
35–5423.7%
55–6412.9%
65+19.0%

Dependency Ratios for Marion County, Missouri

Total Dependency Ratio:
75.5
Youth Dependency:
42.1
Old-Age Dependency:
33.3

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



Age & Gender FAQs for Marion County, Missouri

The median age in Marion County, Missouri is 39.6 years.

According to latest Census data, the total population of Marion County, Missouri is 28,457.

In Marion County, Missouri, seniors (ages 65+) make up 19.0% of the population, while children under 18 represent 16.9%.

Based on historical data since 2010, the population in Marion County, Missouri has remained stable.
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