Demographics & People — Sullivan, Illinois
Population Overview
| Population (Census) | 4,253 |
| Estimated 2026 | ~4,600 |
| Median Age | 38.1 |
| Total Households | 1,780 |
| Family Households | 1,138 |
| Average Household Size | 2.27 |
| Diversity Index | 0.0668 (relatively homogeneous) |
Race & Ethnicity
| White | 4,060 |
| Black or African American | 93 |
| Asian | 13 |
| Hispanic or Latino | 38 |
Heritage & Ancestry
| Group | Count |
| Unclassified or not reported | 2,043 |
| German | 805 |
| English | 537 |
| Other groups | 431 |
| American | 412 |
| Irish | 347 |
| Italian | 106 |
| French (except Basque) | 70 |
| British | 68 |
| Hispanic: Hispanic or Latino | 52 |
Language
| English Only | 3,981 |
| Spanish | 7 |
| Population 5+ | 4,034 |
Veterans
| Veterans | 291 |
| Population 18+ | 3,310 |
Commuting
| Mean Commute Time | 16.3 minutes |
| Work from Home | 1.7% |
| Commuter Profile | N/A |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Sullivan, Illinois.