County in Illinois · 539 sq mi · 23 people per sq mi
12,333 people live in Mason County. The typical household earns $62,845, and the median resident is 45.4 years old.
2026 projection
From 13,050 in 2020
Poverty rate 14.83%
Men 44.6 · Women 45.9
1850–2026
12,333
2026 projection
5.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1850–2026
12,333
2026 projection
5.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 12,333 | -78 | 0.63% |
|---|---|---|---|
| 2025 | 12,411 | -78 | 0.62% |
| 2024 | 12,489 | -91 | 0.72% |
| 2023 | 12,580 | -130 | 1.02% |
| 2022 | 12,710 | -116 | 0.90% |
| 2021 | 12,826 | -224 | 1.72% |
| 2020 | 13,050 | -337 | 2.52% |
| 2019 | 13,387 | -133 | 0.98% |
| 2018 | 13,520 | -152 | 1.11% |
| 2017 | 13,672 | -5 | 0.04% |
Showing 10 of 32 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 127 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 7 residents
51% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 51% | 51% | 51% |
| Never married | 25% | 28% | 22% |
| Divorced | 14% | 13% | 14% |
| Widowed | 9% | 6% | 12% |
| Separated | 1% | 2% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
8 sources, all from the U.S. Census Bureau