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Washtenaw County, MI
9 cities and towns and 15 ZIP codes in Washtenaw County, Michigan.
Population
369,822
Land area
706sq mi
People per sq mi
524
ZIP codes
15
Cities and towns in Washtenaw County
Washtenaw County at a glance
- Washtenaw County is about 2.9 times as dense as Michigan as a whole.
- By population, it ranks 6th among 83 counties in Michigan.
- The median household income is $89,180, 22% above the Michigan median of $72,875.
- A typical owner-occupied home is valued at $374,100 (62% above Michigan) and median rent is $1,463 a month.
- Its largest cities are Ann Arbor (122,036), Ypsilanti (19,857) and Saline (9,006).
Local data for Washtenaw County, MI
Counts from official public data
- Hospitals6
- Emergency Rooms4
- Nursing Homes8
- Schools128
- Colleges5
- Libraries14
- Banks72
- Post Offices18
- Parks274
- Grocery Stores111
- Restaurants1,062
- Affordable Housing22
- Home Health Agencies6
- Hospice Care2
- Dialysis Centers8
- Rehab & Long-Term Care Hospitals2
- Community Health Centers6
- Mental Health & Addiction Treatment14
- Private Schools25
- Community Colleges & Trade Schools2
- Superfund Sites1
- Toxic Release Facilities17
- Historic Places71
Housing and community stats
Washtenaw County, MI, American Community Survey 2020-2024
Median household income
$89,180
Poverty rate
14.2%
Median home value
$374,100
Prices +4.2% in a year
Median rent
$1,463/mo
Homeownership
61.6%
Bachelor's or higher
58.7%
Median age
35.0
Average commute
23.5 min
Largest reported origins and ancestries: German Americans (63,844), Irish Americans (37,837), Polish Americans (22,781).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
4.2%
Aug 2026, -0.3 pts in a year
Average annual pay
$76,751
219,230 jobs, 2025
Income per person
$79,736
BEA, 2024
Federal spending
$3.44B
FY 2026, $9,241 per person
PPP loans
$939M
10,324 loans, 108,542 jobs reported
Campaign donations
$7.58M
Itemized, 2026 cycle
How people get to work
Washtenaw County, MI, workers 16 and older. American Community Survey 5-year estimates
- Drove alone59.4%
- Carpooled6.8%
- Public transit3.7%
- Walked5.6%
- Bicycle1.0%
- Taxi, ride-hailing, motorcycle or other1.0%
- Worked from home22.6%
Average one-way commute: 23.5 minutes for people who do not work from home.
Environment and hazard risk
Washtenaw County, MI, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: strong wind
Storm events since 1996
819
Most often thunderstorm wind
Flood insurance policies
416
0.4% of homes, county
July high / Jan low
84° / 15°F
29.8 inches of rain a year
Hazards, floods and storm historyCheck a flood zone71 historic places
Health statistics
Share of adults in Washtenaw County, MI, CDC PLACES estimates
Obesity
27.5%
U.S. 33.3% -5.8 pts
Diabetes
8.7%
U.S. 12.1% -3.4 pts
Smoking
9.8%
U.S. 12.8% -3.0 pts
Uninsured (18-64)
5.2%
U.S. 11.1% -5.9 pts
Cities, towns and ZIP codes in Washtenaw County
Population shown
Frequently asked questions
- What is the largest city in Washtenaw County, MI?
- Ann Arbor is the largest city or town in Washtenaw County, with about 122,036 residents.
- How many ZIP codes are in Washtenaw County?
- Washtenaw County includes 15 ZIP Code Tabulation Areas, including 48103, 48104, 48105, 48108, 48109.
- What is the population of Washtenaw County, MI?
- About 369,822 people live in Washtenaw County, based on American Community Survey 5-year estimates.
- What counties border Washtenaw County?
- Washtenaw County borders Wayne County, Oakland County, Livingston County, Jackson County, Monroe County, Lenawee County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023