Jefferson County's estimated 2025 population is 18,273 with a growth rate of -0.15% in the past year according to the most recent United States census data. Jefferson County is the 30th largest county in Kansas. The 2010 population was 19,120 and has seen a growth of -4.43% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 93.2% White, and smaller percentages for Black or African American, Native American, other race, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Black or African American
Native American
Other race
Asian
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 17,141 | 93.2% |
| Two or more races | 921 | 5.01% |
| Black or African American | 132 | 0.72% |
| Native American | 95 | 0.52% |
| Other race | 58 | 0.32% |
| Asian | 41 | 0.22% |
| Native Hawaiian or Pacific Islander | 3 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $52,227. Household income levels show a median of $77,393. The poverty rate stands at 6.32%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,625 | - |
| Families | $96,315 | $113,254 |
| Households | $77,393 | $95,339 |
| Non Families | $41,589 | $52,918 |
Average Income
Median Household Income
Poverty Rate
