Demographics & People — St. Peter, Illinois
Population Overview
| Population (Census) | 256 |
| Estimated 2026 | ~600 |
| Median Age | 39.7 |
| Total Households | 104 |
| Family Households | 62 |
| Average Household Size | 2.46 |
| Diversity Index | 0.0 (relatively homogeneous) |
Race & Ethnicity
| White | 251 |
| Black or African American | 0 |
| Asian | 0 |
| Hispanic or Latino | 0 |
Heritage & Ancestry
| Group | Count |
| German | 139 |
| Unclassified or not reported | 85 |
| American | 36 |
| Other groups | 22 |
| Irish | 21 |
| English | 8 |
| Dutch | 6 |
| Polish | 6 |
| French (except Basque) | 5 |
| Italian | 4 |
Language
| English Only | 235 |
| Spanish | 0 |
| Population 5+ | 237 |
Veterans
| Veterans | 10 |
| Population 18+ | 209 |
Commuting
| Mean Commute Time | 22.1 minutes |
| Work from Home | 1.2% |
| 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 St. Peter, Illinois.