Buchanan County's 2026 population is estimated at 84,320, reflecting a 0.44% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Buchanan County is the 15th largest county in Missouri. The 2010 population was 89,071 and has grown -5.33% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.9 years
Female: 40 years
Male: 38.1 years
There are 64,924 adults, (14,577 of whom are seniors) in Buchanan County.
Female: 41,515 (49.7%)
Male: 42,053 (50.3%)
The racial composition of Buchanan County includes 80.84% White, 5.81% Black or African American, 3.41% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 67,554 | 80.84% |
| Two or more races | 6,679 | 7.99% |
| Black or African American | 4,855 | 5.81% |
| Other race | 2,849 | 3.41% |
| Asian | 930 | 1.11% |
| Native American | 352 | 0.42% |
| Native Hawaiian or Pacific Islander | 349 | 0.42% |
Buchanan County 's average per capita income is $44,231. Household income levels show a median of $62,158. The poverty rate stands at 16.02%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $93,213 | $120,151 |
| Families | $76,370 | $101,032 |
| Households | $62,158 | $82,732 |
| Non Families | $37,546 | $51,899 |
Average Income
Median Household Income
Poverty Rate