Lewis County, Washington Age & Gender Statistics (2024)

Total Population

85,154

Median Age

42.2

Male Median

40.9

Female Median

43.0

Lewis County, Washington Population Growth

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

Lewis County, Washington Demographic Trend

Since 2010, the population of has changed by +14.1%%.

+14.1%% Growth

Lewis County, Washington Age & Gender Pyramid

Population pyramid for

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


Lewis County, Washington Historical Population Data

YearMedian AgePopulation
202442.285,154
202342.483,925
202242.482,663
202142.581,214
202042.979,430
201943.178,145
201843.176,947
201742.876,012
201643.175,724
201542.875,515
201442.675,382
201342.275,419
201242.075,399
201141.575,167
201041.174,650

Lewis County, Washington Age Group Breakdown (2024)

Age CohortPercentage
Under 55.7%
5–1716.0%
18–247.0%
25–3412.1%
35–5424.1%
55–6413.8%
65+21.4%

Dependency Ratios for Lewis County, Washington

Total Dependency Ratio:
75.5
Youth Dependency:
38.0
Old-Age Dependency:
37.5

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



Age & Gender FAQs for Lewis County, Washington

The median age in Lewis County, Washington is 42.2 years.

According to latest Census data, the total population of Lewis County, Washington is 85,154.

In Lewis County, Washington, seniors (ages 65+) make up 21.4% of the population, while children under 18 represent 16.0%.

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