Demographics & People — Rochester, Illinois
Population Overview
| Population (Census) | 3,784 |
|---|
| Estimated 2026 | ~3,700 |
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| Median Age | 39.8 |
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| Total Households | 1,383 |
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| Family Households | 1,098 |
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| Average Household Size | 2.74 |
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| Diversity Index | 0.0904 (relatively homogeneous) |
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Race & Ethnicity
| White | 3,585 |
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| Black or African American | 15 |
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| Asian | 97 |
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| Hispanic or Latino | 64 |
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Heritage & Ancestry
| Group | Count |
|---|
| Unclassified or not reported | 958 |
| German | 895 |
| English | 707 |
| Irish | 485 |
| Other groups | 379 |
| Italian | 263 |
| American | 238 |
| Polish | 133 |
| European | 118 |
| Scottish | 84 |
Language
| English Only | 3,595 |
|---|
| Spanish | 0 |
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| Population 5+ | 3,595 |
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Veterans
| Veterans | 216 |
|---|
| Population 18+ | 2,679 |
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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 Rochester, Illinois.
