---
type: Jurisdiction
title: "Mason County, IL"
classification: county
fips: "17125"
state: "IL"
demographics:
  population: 12745
  population_under_18: 2647
  population_18_64: 7159
  population_65_plus: 2939
  median_household_income: 62845
  poverty_rate: 14.83
  homeownership_rate: 81.82
  unemployment_rate: 4.86
  median_home_value: 103400
  gini_index: 0.4243
  vacancy_rate: 12.7
  race_white: 12058
  race_black: 96
  race_asian: 52
  race_native: 54
  hispanic: 205
  bachelors_plus: 2075
districts:
  - to: "us/states/il/districts/15"
    rel: in-district
    area_weight: 0.9999
  - to: "us/states/il/districts/senate/47"
    rel: in-district
    area_weight: 0.9989
  - to: "us/states/il/districts/house/94"
    rel: in-district
    area_weight: 0.9989
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"
---

# Mason County, IL

County jurisdiction.

## Demographics (ACS 2023)

| Measure | Value |
| --- | --- |
| Population | 12745 |
| Under 18 | 2647 |
| 18–64 | 7159 |
| 65+ | 2939 |
| Median household income | 62845 |
| Poverty rate | 14.83 |
| Homeownership rate | 81.82 |
| Unemployment rate | 4.86 |
| Median home value | 103400 |
| Gini index | 0.4243 |
| Vacancy rate | 12.7 |
| White | 12058 |
| Black | 96 |
| Asian | 52 |
| Native | 54 |
| Hispanic/Latino | 205 |
| Bachelor's or higher | 2075 |

## Districts

- [IL-15](/us/states/il/districts/15.md) — 100% (congressional)
- [IL Senate District 47](/us/states/il/districts/senate/47.md) — 100% (state senate)
- [IL House District 94](/us/states/il/districts/house/94.md) — 100% (state house)

## Source

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