Decatur County's estimated 2025 population is 7,605 with a growth rate of -0.39% in the past year according to the most recent United States census data. Decatur County is the 86th largest county in Iowa. The 2010 population was 8,419 and has seen a growth of -9.67% since that time.
Data after 2023 is projected based on recent change
The racial composition of Decatur County includes 92.93% White, and smaller percentages for Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 7,127 | 92.93% |
| Two or more races | 273 | 3.56% |
| Black or African American | 126 | 1.64% |
| Other race | 80 | 1.04% |
| Asian | 40 | 0.52% |
| Native American | 22 | 0.29% |
| Native Hawaiian or Pacific Islander | 1 | 0.01% |
Married
Widowed
Divorced
Separated
Never Married
Decatur County's average per capita income is $40,572. Household income levels show a median of $57,146. The poverty rate stands at 15.21%.
Name | Median | Mean |
|---|---|---|
| Married Families | $74,272 | - |
| Families | $68,609 | $86,592 |
| Households | $57,146 | $70,495 |
| Non Families | $34,808 | $41,726 |
Average Income
Median Household Income
Poverty Rate
