Jefferson County's estimated 2026 population is 18,382 with a growth rate of 0.14% 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 -3.86% 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 (93.2%)
Two or more races (5.01%)
Black or African American (0.72%)
Native American (0.52%)
Other race (0.32%)
Asian (0.22%)
Native Hawaiian or Pacific Islander (0.02%)
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
