Jefferson County's estimated 2026 population is 15,177 with a growth rate of -0.75% 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 -9.85% since that time.
Data after 2023 is projected based on recent change
Overall: 43.7 years
Female: 47.3 years
Male: 41.1 years
There are 13,013 adults, (4,192 of whom are seniors) in Jefferson County.
Female: 7,621 (48.5%)
Male: 8,084 (51.5%)
The racial composition of Jefferson County includes 84.39% White, 8.18% Asian, and smaller percentages for Black or African American, Native American, other race and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 13,253 | 84.39% |
| Asian | 1,285 | 8.18% |
| Two or more races | 543 | 3.46% |
| Black or African American | 399 | 2.54% |
| Native American | 123 | 0.78% |
| Other race | 102 | 0.65% |
Jefferson County's average per capita income is $36,813. Household income levels show a median of $61,620. The poverty rate stands at 15.19%.
Name | Median | Mean |
|---|---|---|
| Married Families | $101,443 | - |
| Families | $95,344 | $110,219 |
| Households | $61,620 | $82,383 |
| Non Families | $33,868 | $48,523 |
Average Income
Median Household Income
Poverty Rate
