Demographics & People — St. Charles, Idaho
Population Overview
| Population (Census) | 168 |
| Estimated 2026 | ~100 |
| Median Age | 34.1 |
| Total Households | 57 |
| Family Households | 32 |
| Average Household Size | 2.95 |
| Diversity Index | 0.0 (relatively homogeneous) |
Race & Ethnicity
| White | 168 |
| Black or African American | 0 |
| Asian | 0 |
| Hispanic or Latino | 0 |
Heritage & Ancestry
| Group | Count |
| English | 91 |
| German | 25 |
| Irish | 20 |
| Swiss | 18 |
| American | 11 |
| Danish | 7 |
| Other groups | 7 |
| Hispanic: Mexican | 7 |
| Hispanic: Hispanic or Latino | 7 |
| European | 5 |
Language
| English Only | 167 |
| Spanish | 0 |
| Population 5+ | 167 |
Veterans
| Veterans | 11 |
| Population 18+ | 106 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013 (county fallback). Data for St. Charles, Idaho.