Demographics & People — Jefferson County, Illinois
Population & Households
| Population (official) | 37,043 |
|---|---|
| Median Age | 41.20 |
| Veterans | 2,343 |
| Housing Units | 16,659 |
| Uninsured | 516 |
Migration
| Inflow | 31,671 |
|---|---|
| Outflow | 32,191 |
| Net | -520 |
| Growing | No |
| 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 2026-04-13T15:43:27.650787+00:00; aggregated 2026-04-13T16:08:22.925193+00:00.