---
type: Jurisdiction
title: "Marion County, IL"
classification: county
fips: "17121"
state: "IL"
demographics:
  population: 37000
  population_under_18: 8685
  population_18_64: 20842
  population_65_plus: 7473
  median_household_income: 61240
  poverty_rate: 15.37
  homeownership_rate: 74.65
  unemployment_rate: 5.87
  median_home_value: 103000
  gini_index: 0.4345
  vacancy_rate: 10.51
  race_white: 33280
  race_black: 1097
  race_asian: 270
  race_native: 38
  hispanic: 812
  bachelors_plus: 5673
districts:
  - to: "us/states/il/districts/12"
    rel: in-district
    area_weight: 0.9996
  - to: "us/states/il/districts/senate/55"
    rel: in-district
    area_weight: 0.9682
  - to: "us/states/il/districts/senate/58"
    rel: in-district
    area_weight: 0.0318
  - to: "us/states/il/districts/house/110"
    rel: in-district
    area_weight: 0.9682
  - to: "us/states/il/districts/house/116"
    rel: in-district
    area_weight: 0.0318
sources:
  - field: demographics
    source: "Census ACS 2023"
  - field: districts
    source: "PostGIS area-intersection over Census TIGER 2024 boundaries"
confidence: official
tags: [jurisdiction, county, il]
timestamp: "2026-07-03"
---

# Marion County, IL

County jurisdiction.

## Demographics (ACS 2023)

| Measure | Value |
| --- | --- |
| Population | 37000 |
| Under 18 | 8685 |
| 18–64 | 20842 |
| 65+ | 7473 |
| Median household income | 61240 |
| Poverty rate | 15.37 |
| Homeownership rate | 74.65 |
| Unemployment rate | 5.87 |
| Median home value | 103000 |
| Gini index | 0.4345 |
| Vacancy rate | 10.51 |
| White | 33280 |
| Black | 1097 |
| Asian | 270 |
| Native | 38 |
| Hispanic/Latino | 812 |
| Bachelor's or higher | 5673 |

## Districts

- [IL-12](/us/states/il/districts/12.md) — 100% (congressional)
- [IL Senate District 55](/us/states/il/districts/senate/55.md) — 97% (state senate)
- [IL Senate District 58](/us/states/il/districts/senate/58.md) — 3% (state senate)
- [IL House District 110](/us/states/il/districts/house/110.md) — 97% (state house)
- [IL House District 116](/us/states/il/districts/house/116.md) — 3% (state house)

## Source

- demographics: Census ACS 2023
- districts: PostGIS area-intersection over Census TIGER 2024 boundaries