Lewis County's 2026 population is estimated at 88,619, reflecting a 0.89% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Lewis County is the 15th largest county in Washington. The 2010 population was 75,503 and has grown 17.37% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.2 years
Female: 43 years
Male: 40.9 years
There are 66,731 adults, (18,211 of whom are seniors) in Lewis County.
Female: 42,315 (49.7%)
Male: 42,839 (50.3%)
The racial composition of Lewis County includes 82.22% White, 3.24% other race, and smaller percentages for Native American, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 70,016 | 82.22% |
| Two or more races | 9,250 | 10.86% |
| Other race | 2,762 | 3.24% |
| Native American | 1,203 | 1.41% |
| Asian | 1,011 | 1.19% |
| Black or African American | 713 | 0.84% |
| Native Hawaiian or Pacific Islander | 199 | 0.23% |
Lewis County 's average per capita income is $49,424. Household income levels show a median of $74,796. The poverty rate stands at 12.22%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $101,832 | $118,480 |
| Families | $90,311 | $107,567 |
| Households | $74,796 | $92,194 |
| Non Families | $36,151 | $52,588 |
Average Income
Median Household Income
Poverty Rate