| Name | Jefferson County |
| State | Idaho |
| FIPS Code | 16051 |
| County Seat | Rigby |
| Timezone | Mountain Standard Time (MST) |
| Population (2022) | 25,940 |
| Population Growth Rate(2000-2022) | 18.18% |
| Majority Ethnicity | White 98.71% |
| Public School Majority Ethnicity | White 85% |
| Partisan Voting Index | Strongly Republican:+30 |
| Unemployment Rate (January 2025) | 3.0% |
| Area Code(s) | 208 / 986 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 98.71% |
| African American | 0.12% |
| Hispanic | 0.9% |
| Asian | 0.26% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 0.01% |
| 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% |