County in Iowa · 436 sq mi · 35 people per sq mi
15,177 people live in Jefferson County. The typical household earns $61,620, and the median resident is 43.7 years old.
2026 projection
From 15,688 in 2020
Poverty rate 15.19%
Men 41.1 · Women 47.3
1840–2026
15,177
2026 projection
3.3% 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.
1840–2026
15,177
2026 projection
3.3% 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 | 15,177 | -114 | 0.75% |
|---|---|---|---|
| 2025 | 15,291 | -114 | 0.74% |
| 2024 | 15,405 | -59 | 0.38% |
| 2023 | 15,464 | -116 | 0.74% |
| 2022 | 15,580 | -215 | 1.36% |
| 2021 | 15,795 | +107 | 0.68% |
| 2020 | 15,688 | -2,492 | 13.71% |
| 2019 | 18,180 | +78 | 0.43% |
| 2018 | 18,102 | -6 | 0.03% |
| 2017 | 18,108 | +81 | 0.45% |
Showing 10 of 33 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 157 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 7 residents
48% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 48% | 45% | 51% |
| Never married | 33% | 39% | 27% |
| Divorced | 14% | 11% | 16% |
| Widowed | 5% | 4% | 6% |
| Separated | <1% | <1% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
8 sources, all from the U.S. Census Bureau