Washington County, Missouri Age & Gender Statistics (2024)

Total Population

23,470

Median Age

40.7

Male Median

39.8

Female Median

42.1

Washington County, Missouri Population Growth

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

Washington County, Missouri Demographic Trend

Since 2010, the population of has changed by -6.0%%.

-6.0%% Growth

Washington County, Missouri Age & Gender Pyramid

Population pyramid for

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


Washington County, Missouri Historical Population Data

YearMedian AgePopulation
202440.723,470
202340.223,483
202239.823,580
202140.223,791
202040.524,819
201940.824,860
201840.724,931
201740.624,968
201640.725,002
201540.125,048
201439.925,113
201340.225,135
201240.125,120
201139.525,069
201039.524,981

Washington County, Missouri Age Group Breakdown (2024)

Age CohortPercentage
Under 55.6%
5–1718.0%
18–247.1%
25–3411.8%
35–5425.2%
55–6414.4%
65+17.9%

Dependency Ratios for Washington County, Missouri

Total Dependency Ratio:
70.9
Youth Dependency:
40.2
Old-Age Dependency:
30.6

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



Age & Gender FAQs for Washington County, Missouri

The median age in Washington County, Missouri is 40.7 years.

According to latest Census data, the total population of Washington County, Missouri is 23,470.

In Washington County, Missouri, seniors (ages 65+) make up 17.9% of the population, while children under 18 represent 18.0%.

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