Demographics & People — Mercer Island, Washington
Population Overview
| Population (Census) | 25,282 |
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| Estimated 2026 | ~25,400 |
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| Median Age | 46.4 |
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| Total Households | 9,893 |
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| Family Households | 7,025 |
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| Average Household Size | 2.54 |
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| Diversity Index | 0.4277 (moderately diverse) |
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Race & Ethnicity
| White | 16,609 |
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| Black or African American | 363 |
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| Asian | 5,649 |
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| Hispanic or Latino | 588 |
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Heritage & Ancestry
| Group | Count |
|---|
| Other groups | 8,678 |
| Unclassified or not reported | 3,421 |
| English | 3,322 |
| German | 3,085 |
| Irish | 2,248 |
| Italian | 1,187 |
| Norwegian | 1,012 |
| European | 962 |
| Polish | 861 |
| Hispanic: Hispanic or Latino | 826 |
Language
| English Only | 18,419 |
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| Spanish | 431 |
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| Population 5+ | 24,304 |
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Veterans
| Veterans | 856 |
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| Population 18+ | 19,582 |
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Commuting
| Mean Commute Time | 23.6 minutes |
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| Work from Home | 38.6% |
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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 Mercer Island, Washington.
