Demographics & People — Fairfield, Idaho
Population Overview
| Population (Census) | 519 |
| Estimated 2026 | ~500 |
| Median Age | 35.7 |
| Total Households | 141 |
| Family Households | 73 |
| Average Household Size | 3.68 |
| Diversity Index | 0.2752 (somewhat diverse) |
Race & Ethnicity
| White | 365 |
| Black or African American | 0 |
| Asian | 0 |
| Hispanic or Latino | 72 |
Heritage & Ancestry
| Group | Count |
| Other groups | 268 |
| American | 73 |
| Unclassified or not reported | 35 |
| German | 28 |
| Swedish | 21 |
| Scottish | 21 |
| Polish | 20 |
| Hispanic: Mexican | 17 |
| Hispanic: Hispanic or Latino | 17 |
| Italian | 14 |
Language
| English Only | 433 |
| Spanish | 41 |
| Population 5+ | 478 |
Veterans
| Veterans | 47 |
| Population 18+ | 335 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Fairfield, Idaho.