Snohomish County, Washington Age & Gender Statistics (2024)

Total Population

844,430

Median Age

38.6

Male Median

38.0

Female Median

39.1

Snohomish County, Washington Population Growth

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

Snohomish County, Washington Demographic Trend

Since 2010, the population of has changed by +21.6%%.

+21.6%% Growth

Snohomish County, Washington Age & Gender Pyramid

Population pyramid for

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


Snohomish County, Washington Historical Population Data

YearMedian AgePopulation
202438.6844,430
202338.4834,648
202238.3828,337
202138.2820,024
202038.0811,572
201938.0798,808
201837.8786,620
201737.8771,904
201637.8758,649
201537.6746,653
201437.5735,351
201337.3724,627
201237.2714,443
201136.9704,536
201036.7694,219

Snohomish County, Washington Age Group Breakdown (2024)

Age CohortPercentage
Under 56.0%
5–1716.1%
18–247.2%
25–3414.9%
35–5428.4%
55–6412.6%
65+14.8%

Dependency Ratios for Snohomish County, Washington

Total Dependency Ratio:
58.5
Youth Dependency:
35.1
Old-Age Dependency:
23.4

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



Age & Gender FAQs for Snohomish County, Washington

The median age in Snohomish County, Washington is 38.6 years.

According to latest Census data, the total population of Snohomish County, Washington is 844,430.

In Snohomish County, Washington, seniors (ages 65+) make up 14.8% of the population, while children under 18 represent 16.1%.

Based on historical data since 2010, the population in Snohomish County, Washington is aging.
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