Jefferson County's estimated 2026 population is 18,285 with a growth rate of -0.06% 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 -4.37% since that time.
Data after 2023 is projected based on recent change
Overall: 44.2 years
Female: 44.4 years
Male: 44.1 years
There are 14,316 adults, (3,666 of whom are seniors) in Jefferson County.
Female: 9,064 (49.4%)
Male: 9,285 (50.6%)
The racial composition of Jefferson County includes 92.54% White, and smaller percentages for Black or African American, Native American, other race, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 16,980 | 92.54% |
| Two or more races | 1,044 | 5.69% |
| Black or African American | 111 | 0.6% |
| Native American | 92 | 0.5% |
| Other race | 74 | 0.4% |
| Asian | 45 | 0.25% |
| Native Hawaiian or Pacific Islander | 3 | 0.02% |
Jefferson County's average per capita income is $53,001. Household income levels show a median of $81,278. The poverty rate stands at 5.64%.
Name | Median | Mean |
|---|---|---|
| Married Families | $109,262 | - |
| Families | $100,625 | $118,982 |
| Households | $81,278 | $100,809 |
| Non Families | $43,238 | $54,120 |
Average Income
Median Household Income
Poverty Rate
