Lewis County, Washington Age & Gender Distribution (2024)
Population distribution by age and gender for Lewis County, Washington
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

Lewis County, Washington Demographic Trend
Since 2010, the population of has changed by +14.1%%.
+14.1%% Growth
Lewis County, Washington Age & Gender Pyramid

Figure 2: Population distribution by age and gender for 2024.
Lewis County, Washington Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 42.2 | 85,154 |
| 2023 | 42.4 | 83,925 |
| 2022 | 42.4 | 82,663 |
| 2021 | 42.5 | 81,214 |
| 2020 | 42.9 | 79,430 |
| 2019 | 43.1 | 78,145 |
| 2018 | 43.1 | 76,947 |
| 2017 | 42.8 | 76,012 |
| 2016 | 43.1 | 75,724 |
| 2015 | 42.8 | 75,515 |
| 2014 | 42.6 | 75,382 |
| 2013 | 42.2 | 75,419 |
| 2012 | 42.0 | 75,399 |
| 2011 | 41.5 | 75,167 |
| 2010 | 41.1 | 74,650 |
Lewis County, Washington Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.7% |
| 5–17 | 16.0% |
| 18–24 | 7.0% |
| 25–34 | 12.1% |
| 35–54 | 24.1% |
| 55–64 | 13.8% |
| 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.