Demographics & People — Thompsonville, Illinois
Population Overview
| Population (Census) | 475 |
| Estimated 2026 | ~600 |
| Median Age | 40.3 |
| Total Households | 230 |
| Family Households | 99 |
| Average Household Size | 2.07 |
| Diversity Index | 0.0086 (relatively homogeneous) |
Race & Ethnicity
| White | 460 |
| Black or African American | 2 |
| Asian | 0 |
| Hispanic or Latino | 0 |
Heritage & Ancestry
| Group | Count |
| Unclassified or not reported | 297 |
| German | 84 |
| Irish | 75 |
| Other groups | 64 |
| English | 36 |
| European | 15 |
| American | 14 |
| Lithuanian | 13 |
| Scottish | 13 |
| Italian | 9 |
Language
| English Only | 404 |
| Spanish | 0 |
| Population 5+ | 404 |
Veterans
| Veterans | 26 |
| Population 18+ | 418 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Thompsonville, Illinois.