Washtenaw County, Michigan Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 6th-largest in Michigan
The population of Washtenaw County, Michigan is 368,394 as of the 2023 American Community Survey, making it the 6th-largest county in Michigan. The median household income is $87,156, the median home value is $353,000, and the median age is 34.8.
The population of Washtenaw County has grown 8.1% since 2010 (345,980 → 373,875), a +0.56% annualized rate.
368,394
Population
+0.56%
Annual growth
522
People / sq mi
$87,156
Median Income
$353,000
Median Home Value
Washtenaw County covers 706 sq mi of land at 521.8 people per square mile.
About Washtenaw County, MI
Washtenaw County is defined demographically by education — 58.1% of adults hold a bachelor’s degree, above the national average. With 368,394 residents, Washtenaw County is a county in Michigan. That makes it one of the ten largest counties in Michigan in the country, at #6 by population.
Earnings sit at the high end: a median household income of $87,156, above the US median of $78,538. Only 6.7% of residents live in poverty, below the national 12.4%. Home values run above average at $353,000, with typical rent around $1,400.
The population is unusually well-credentialed for US counties — 58.1% of adults have a four-year degree, above the national 35.0%. Working from home is common here: 20.3% of workers do so, above the national 14.0%, and the average commute runs about 23 minutes each way.
The education numbers are the throughline: a college-heavy population in Washtenaw County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Washtenaw County Population History (2010-2024)
The county of Washtenaw County had a population of 345,980 in 2010 and 373,875 in 2024, a 8.1% growth over 14 years. The peak was 373,875 in 2024. Average annual growth rate: 0.56%.
373,875
Population (2024)
345,980
Population (2010)
373,875
Peak (2024)
0.56%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 345,980 |
| 2011 | 350,072 |
| 2012 | 352,685 |
| 2013 | 356,474 |
| 2014 | 360,523 |
| 2015 | 363,555 |
| 2016 | 366,960 |
| 2017 | 369,703 |
| 2018 | 370,548 |
| 2019 | 368,242 |
| 2020 | 371,849 |
| 2021 | 365,041 |
| 2022 | 367,947 |
| 2023 | 370,398 |
| 2024 | 373,875 |
Race & Ethnicity
| White | 69.9% |
| Black or African American | 11.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
34.8
Median Age
50.1%
Female
49.9%
Male
15.2%
Age 65+
Age Distribution
Children (under 15): 14.9% · Seniors (65+): 15.2%
Income & Poverty
| Median household income | $87,156+$16,007 vs state |
| Mean household income | $122,847 |
| Per-capita income | $51,746 |
| Poverty rate | 6.7%-2.1% vs state |
| Unemployment rate | 2.8% |
| Employment-to-population | 60.6% |
Top Industries by Employment
The largest employment sector in Washtenaw County is professional & business services, accounting for 37.5% of workers.
How residents commute
3.8%
Drive alone
5.8%
Carpool
61.9%
Public transit
20.3%
Work from home
23.4 min
Avg commute
Housing
$353,000+$135,400 vs state
Median home value
$1,400
Median rent
61.6%
Homeownership rate
158,115
Total housing units
94.4%
Occupied
5.6%
Vacant
38.4%
Renter-occupied
Social & access
96.7%
With health insurance
97.5%
With broadband internet
26.8%
Foreign-born
4.2%
Veterans (18+)
10.3%
With a disability
84.6%
Speak language other than English at home
Education
95.8%
High School+
58.1%
Bachelor's+
Largest cities in Michigan
Other counties in Michigan
Part of Michigan
Metro areas in Michigan
County rankings
Frequently Asked Questions
Washtenaw County, Michigan has a population of 368,394 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 6th-largest county in Michigan. Population density is 522 people per square mile.
The population of Washtenaw County has grown 8.1% since 2010 (345,980 → 373,875), a +0.56% annualized rate.
The median household income in Washtenaw County, Michigan is $87,156, with mean (average) household income of $122,847 and per-capita income of $51,746. 6.7% of residents live below the federal poverty level.
In Washtenaw County, the largest racial and ethnic groups are White (69.9%), Black or African American (11.6%), Hispanic or Latino (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Washtenaw County, Michigan is 34.8 years. Residents are 50.1% female and 49.9% male.
The median home value in Washtenaw County is $353,000 and median monthly rent is $1,400. 61.6% of occupied housing units are owner-occupied. The county has 158,115 total housing units, 5.6% of which are vacant.
The largest employment sector in Washtenaw County, Michigan is professional, scientific, and management services, employing 37.5% of workers. The unemployment rate is 2.8%.
Detroit is among the largest cities associated with Washtenaw County, Michigan, with a population of 636,644.
Washtenaw County, MI Climate
Washtenaw County, MI has an average annual temperature of 8.6°C (47°F) and receives about 838 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.6°C
Avg Temp
838
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -5° / 22° | 46 mm |
| February | -4° / 24° | 44 mm |
| March | 1° / 35° | 65 mm |
| April | 8° / 46° | 80 mm |
| May | 14° / 58° | 75 mm |
| June | 19° / 67° | 88 mm |
| July | 22° / 71° | 76 mm |
| August | 21° / 69° | 85 mm |
| September | 16° / 61° | 83 mm |
| October | 10° / 50° | 61 mm |
| November | 4° / 38° | 71 mm |
| December | -2° / 28° | 64 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Washtenaw County, MI
The most comfortable months to visit Washtenaw County, MI are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 28°C high). The coldest is January (near -9°C low). June is usually the wettest month.
Where to stay near Washtenaw County
Visiting or relocating to Washtenaw County, MI? Compare hotels and short-term rentals across the county — live availability and prices.
Top-rated places to stay near Washtenaw County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a move to Washtenaw County?
Get relocation and cost-of-living insights for Washtenaw County, MI by email. No spam, unsubscribe anytime.
More from Michigan
Population 1,773,767
Population 1,272,294
Population 877,624
Population 658,844
Full rankings of Michigan counties
Statewide data for Michigan
Population, race, income, age, and trends across Michigan
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.