Buchanan County's estimated 2026 population is 20,749 with a growth rate of 0.04% in the past year according to the most recent United States census data. Buchanan County is the 31st largest county in Iowa. The 2010 population was 20,975 and has seen a growth of -1.08% since that time.
Data after 2023 is projected based on recent change
The racial composition of Buchanan County includes 96.43% White, and smaller percentages for Two or more races, Black or African American, Native American, Asian, other race, Native Hawaiian or Pacific Islander and multiracial populations.
White (96.43%)
Two or more races (2.11%)
Black or African American (0.75%)
Native American (0.25%)
Asian (0.22%)
Other race (0.17%)
Native Hawaiian or Pacific Islander (0.08%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 19,907 | 96.43% |
| Two or more races | 435 | 2.11% |
| Black or African American | 154 | 0.75% |
| Native American | 52 | 0.25% |
| Asian | 46 | 0.22% |
| Other race | 35 | 0.17% |
| Native Hawaiian or Pacific Islander | 16 | 0.08% |
Married
Widowed
Divorced
Separated
Never Married
Buchanan County's average per capita income is $46,287. Household income levels show a median of $78,430. The poverty rate stands at 7.03%.
Name | Median | Mean |
|---|---|---|
| Married Families | $103,922 | - |
| Families | $92,016 | $108,847 |
| Households | $78,430 | $92,603 |
| Non Families | $37,599 | $51,631 |
Average Income
Median Household Income
Poverty Rate