| Name | Jefferson County |
| State | Idaho |
| FIPS Code | 16051 |
| County Seat | Rigby |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 34,259 |
| Population Growth Rate(2020-2024) | 9.83% |
| Majority Ethnicity | White 88.36% |
| Public School Majority Ethnicity | White 85% |
| Partisan Voting Index | Strongly Republican:+37 |
| Unemployment Rate (May 2026) | 3.5% |
| Sales Tax Rate (2025) | 6% |
| Area Code(s) | 208 / 986 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 88.36% |
| African American | 0.12% |
| Hispanic | 10.82% |
| Asian | 0.07% |
| Native American | 0.61% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 84.57% |
| African American | 0.27% |
| Hispanic | 12.3% |
| Asian | 0.23% |
| Native American | 0.23% |
| Hawaiin/Pacific Islander | 0.12% |