County in Kansas · 533 sq mi · 34 people per sq mi
18,285 people live in Jefferson County. The typical household earns $81,278, and the median resident is 44.2 years old.
2026 projection
From 18,330 in 2020
Poverty rate 5.64%
Men 44.1 · Women 44.4
1860–2026
18,285
2026 projection
0.2% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1860–2026
18,285
2026 projection
0.2% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 18,285 | -11 | 0.06% |
|---|---|---|---|
| 2025 | 18,296 | -11 | 0.06% |
| 2024 | 18,307 | +10 | 0.05% |
| 2023 | 18,297 | -53 | 0.29% |
| 2022 | 18,350 | -96 | 0.52% |
| 2021 | 18,446 | +116 | 0.63% |
| 2020 | 18,330 | -835 | 4.36% |
| 2019 | 19,165 | +264 | 1.40% |
| 2018 | 18,901 | -34 | 0.18% |
| 2017 | 18,935 | +97 | 0.51% |
Showing 10 of 31 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 183 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 18 residents
59% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 59% | 60% | 58% |
| Never married | 22% | 25% | 18% |
| Divorced | 12% | 12% | 12% |
| Widowed | 7% | 3% | 11% |
| Separated | <1% | <1% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
8 sources, all from the U.S. Census Bureau