| Name | Washtenaw County |
| State | Michigan |
| FIPS Code | 26161 |
| County Seat | Ann Arbor |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 370,398 |
| Population Growth Rate(2020-2024) | -0.5% |
| Majority Ethnicity | White 72.59% |
| Public School Majority Ethnicity | White 60% |
| Partisan Voting Index | Strongly Democratic:+22 |
| Unemployment Rate (May 2026) | 3.7% |
| Sales Tax Rate (2025) | 6% |
| Area Code(s) | 734 / 517 / 248 / 947 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 72.59% |
| African American | 12.05% |
| Hispanic | 5.86% |
| Asian | 9.19% |
| Native American | 0.28% |
| Hawaiin/Pacific Islander | 0.03% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 59.88% |
| African American | 14.72% |
| Hispanic | 7.99% |
| Asian | 8.2% |
| Native American | 0.23% |
| Hawaiin/Pacific Islander | 0.05% |