Demographics & People — Cortland, Illinois
Population Overview
| Population (Census) | 4,556 |
| Estimated 2026 | ~4,600 |
| Median Age | 31.5 |
| Total Households | 1,577 |
| Family Households | 1,105 |
| Average Household Size | 2.89 |
| Diversity Index | 0.4232 (moderately diverse) |
Race & Ethnicity
| White | 3,435 |
| Black or African American | 450 |
| Asian | 0 |
| Hispanic or Latino | 795 |
Heritage & Ancestry
| Group | Count |
| Other groups | 1,312 |
| German | 1,240 |
| Hispanic: Hispanic or Latino | 769 |
| Unclassified or not reported | 724 |
| Irish | 715 |
| Polish | 488 |
| Hispanic: South American | 327 |
| Hispanic: Mexican | 318 |
| Hispanic: Colombian | 282 |
| English | 277 |
Language
| English Only | 3,912 |
| Spanish | 325 |
| Population 5+ | 4,271 |
Veterans
| Veterans | 163 |
| Population 18+ | 3,636 |
Commuting
| Mean Commute Time | 25.5 minutes |
| Work from Home | 9.6% |
| 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 Cortland, Illinois.