| Place Name | Jefferson City |
| Place Type | Census Designated Place |
| ZIP Code(s) | 59638 |
| County | Jefferson County |
| Area Code(s) | 406 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 488 |
| Population Growth Rate (2010-19) | 26.48% |
| Majority Ethnicity | White 98.58% |
| Metro/Micro Stats Area | Helena, MT |
| US Congressional District(s) | Montana At-Large |
| State House Districts | 75 |
| State Senate Districts | 38 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.58% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.42% |