Demographics & People — Jefferson County, Montana
Population & Households
| Population (official) | 12,273 |
|---|---|
| Median Age | 47.40 |
| Veterans | 1,171 |
| Housing Units | 5,359 |
| Uninsured | 59 |
Migration
| Inflow | 14,093 |
|---|---|
| Outflow | 13,274 |
| Net | 819 |
| Growing | Yes |
| Year | 2022-2023 |
Source: Census ACS 5-Year 2022. Official numbers: Census ACS 5-Year 2022 — county-level query.
Data provenance: aggregated from town-level sources, county.json. Rebuilt 2026-04-13T15:43:29.005642+00:00; aggregated 2026-04-13T16:08:24.174553+00:00.