How many people live in Cowlitz County, WA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 114,000 people living in Cowlitz County, WA. That makes Cowlitz County the 12th-most populous county in Washington. It is home to 1.4% of people living in the state.
114K
population of Cowlitz County, WA (2024)
1.4%
County share of the Washington population (2024)
About 114,000 people lived in Cowlitz County, WA in 2024.
Population estimates, 2000–2024
What are Cowlitz County, WA’s age demographics?
About 23,400 Cowlitz County, WA residents are aged 65 and older in 2024. That represents 20.5% of its population. For comparison, the age group represents 17.4% of Washington’s population and 18% in the US overall.
Another 25,200 Cowlitz County residents, or 22.1% of the population, were children under 18. For comparison, the age group represents 20.9% of Washington’s population and 21.6% in the US overall.
A higher share of Cowlitz County, WA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Cowlitz County, WA’s racial and ethnic demographics?
Non-Hispanic white residents make up 80.5% of the Cowlitz County, WA population, higher than the national share of 57.5%. Cowlitz County, WA also has a larger share of people identifying as non-Hispanic two or more races (3.6%) than the US overall (2.5%).
In contrast, Cowlitz County’s non-Hispanic Black or African American population accounts for 1%, below the 12.6% nationwide, and the Hispanic population makes up 11.1% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Cowlitz County, WA has a higher share of a non-Hispanic white population than Washington as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Cowlitz County, WA is Longview with about 38,300 residents in 2024.
Cities and towns in Cowlitz County, WA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Longview | 38,294 |
| 2. | Kelso | 12,737 |
| 3. | Woodland (pt.) | 6,414 |
| 4. | Kalama | 3,131 |
| 5. | Castle Rock | 2,445 |
| 6. | Balance of Cowlitz County | 50,961 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
