Decatur County's estimated 2026 population is 7,635 with a growth rate of -0.26% 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 -9.31% since that time.
Data after 2023 is projected based on recent change
Overall: 36.1 years
Female: 38.6 years
Male: 34.1 years
There are 6,038 adults, (1,639 of whom are seniors) in Decatur County.
Female: 3,909 (50.4%)
Male: 3,850 (49.6%)
The racial composition of Decatur County includes 91.78% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 7,121 | 91.78% |
| Two or more races | 356 | 4.59% |
| Other race | 107 | 1.38% |
| Black or African American | 102 | 1.31% |
| Asian | 56 | 0.72% |
| Native American | 16 | 0.21% |
| Native Hawaiian or Pacific Islander | 1 | 0.01% |
Decatur County's average per capita income is $41,572. Household income levels show a median of $59,044. The poverty rate stands at 14.56%.
Name | Median | Mean |
|---|---|---|
| Married Families | $83,419 | - |
| Families | $75,313 | $92,355 |
| Households | $59,044 | $74,390 |
| Non Families | $36,786 | $44,710 |
Average Income
Median Household Income
Poverty Rate
