Demographics & People — Seneca, Illinois
Population Overview
| Population (Census) | 2,525 |
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| Estimated 2026 | ~2,300 |
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| Median Age | 35.5 |
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| Total Households | 927 |
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| Family Households | 684 |
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| Average Household Size | 2.72 |
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| Diversity Index | 0.137 (relatively homogeneous) |
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Race & Ethnicity
| White | 2,269 |
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| Black or African American | 28 |
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| Asian | 0 |
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| Hispanic or Latino | 151 |
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Heritage & Ancestry
| Group | Count |
|---|
| Unclassified or not reported | 830 |
| German | 641 |
| Irish | 507 |
| Other groups | 277 |
| Italian | 214 |
| Norwegian | 184 |
| English | 180 |
| Polish | 164 |
| Hispanic: Hispanic or Latino | 139 |
| Hispanic: Mexican | 109 |
Language
| English Only | 2,261 |
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| Spanish | 52 |
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| Population 5+ | 2,313 |
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Veterans
| Veterans | 205 |
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| Population 18+ | 1,887 |
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Commuting
| Mean Commute Time | 26.2 minutes |
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| Work from Home | 8.2% |
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| Commuter Profile | N/A |
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Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Seneca, Illinois.
