Jefferson County's estimated 2026 population is 16,091 with a growth rate of 0.97% in the past year according to the most recent United States census data. Jefferson County is the 48th largest county in Iowa. The 2010 population was 16,835 and has seen a growth of -4.42% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 84.65% White, 5.95% Black or African American, 4.61% Asian, and smaller percentages for other race, Native American and multiracial populations.
White (84.65%)
Black or African American (5.95%)
Asian (4.61%)
Two or more races (3.09%)
Other race (0.86%)
Native American (0.84%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 13,269 | 84.65% |
| Black or African American | 932 | 5.95% |
| Asian | 723 | 4.61% |
| Two or more races | 485 | 3.09% |
| Other race | 135 | 0.86% |
| Native American | 132 | 0.84% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $35,877. Household income levels show a median of $56,824. The poverty rate stands at 14.55%.
Name | Median | Mean |
|---|---|---|
| Married Families | $91,578 | - |
| Families | $78,622 | $100,743 |
| Households | $56,824 | $78,591 |
| Non Families | $32,917 | $50,190 |
Average Income
Median Household Income
Poverty Rate
