Demographics & People — Marion County, Illinois

Population & Households

Population (official)37,543
Median Age41.90
Veterans2,591
Housing Units17,431
Uninsured237

Migration

Inflow33,145
Outflow33,103
Net42
GrowingYes
Year2022-2023

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 2026-04-13T15:43:27.697609+00:00; aggregated 2026-04-13T16:08:22.965764+00:00.