Lewis County's 2026 population is estimated at 9,876, reflecting a 0.12% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Lewis County is the 86th largest county in Missouri. The 2010 population was 10,206 and has grown -3.23% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.6 years
Female: 39.3 years
Male: 36 years
There are 7,816 adults, (1,912 of whom are seniors) in Lewis County.
Female: 4,888 (49.3%)
Male: 5,036 (50.7%)
The racial composition of Lewis County includes 91.7% White, 3.86% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 9,100 | 91.7% |
| Black or African American | 383 | 3.86% |
| Two or more races | 383 | 3.86% |
| Asian | 50 | 0.5% |
| Other race | 6 | 0.06% |
| Native American | 2 | 0.02% |
Lewis County 's average per capita income is $42,397. Household income levels show a median of $59,934. The poverty rate stands at 12.69%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $89,583 | - |
| Families | $86,510 | $100,891 |
| Households | $59,934 | $75,912 |
| Non Families | $31,647 | $37,331 |
Average Income
Median Household Income
Poverty Rate