Cowlitz County's estimated 2026 population is 115,866 with a growth rate of 0.82% in the past year according to the most recent United States census data. Cowlitz County is the 12th largest county in Washington. The 2010 population was 102,358 and has seen a growth of 13.2% since that time.
Data after 2023 is projected based on recent change
The racial composition of Cowlitz County includes 84.77% White, and smaller percentages for other race, Asian, Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
White (84.77%)
Two or more races (9.18%)
Other race (2.76%)
Asian (1.18%)
Native American (1.11%)
Black or African American (0.7%)
Native Hawaiian or Pacific Islander (0.3%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 94,551 | 84.77% |
| Two or more races | 10,242 | 9.18% |
| Other race | 3,080 | 2.76% |
| Asian | 1,311 | 1.18% |
| Native American | 1,243 | 1.11% |
| Black or African American | 779 | 0.7% |
| Native Hawaiian or Pacific Islander | 333 | 0.3% |
Married
Widowed
Divorced
Separated
Never Married
Cowlitz County's average per capita income is $49,245. Household income levels show a median of $72,932. The poverty rate stands at 13%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,036 | $121,273 |
| Families | $86,738 | $106,897 |
| Households | $72,932 | $92,523 |
| Non Families | $40,767 | $57,106 |
Average Income
Median Household Income
Poverty Rate