Demographics & People — Mason City, Illinois
Population Overview
| Population (Census) | 2,094 |
| Estimated 2026 | ~2,300 |
| Median Age | 49.8 |
| Total Households | 1,009 |
| Family Households | 554 |
| Average Household Size | 2.01 |
| Diversity Index | 0.0383 (relatively homogeneous) |
Race & Ethnicity
| White | 2,010 |
| Black or African American | 40 |
| Asian | 0 |
| Hispanic or Latino | 0 |
Heritage & Ancestry
| Group | Count |
| Unclassified or not reported | 689 |
| German | 574 |
| English | 383 |
| Irish | 276 |
| American | 234 |
| Other groups | 208 |
| Polish | 91 |
| French (except Basque) | 61 |
| Italian | 54 |
| Australian | 39 |
Language
| English Only | 1,955 |
| Spanish | 15 |
| Population 5+ | 1,990 |
Veterans
| Veterans | 95 |
| Population 18+ | 1,796 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Mason City, Illinois.