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.

Washtenaw County within Michigan · Source: US Census TIGER/Line via us-atlas

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%.

Washtenaw County population, 2010–2024 · Source: U.S. Census Bureau — decennial census & Population Estimates

373,875

Population (2024)

345,980

Population (2010)

373,875

Peak (2024)

0.56%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	345,980	-	-	estimate
2011	350,072	+4,092	+1.18%	estimate
2012	352,685	+2,613	+0.75%	estimate
2013	356,474	+3,789	+1.07%	estimate
2014	360,523	+4,049	+1.14%	estimate
2015	363,555	+3,032	+0.84%	estimate
2016	366,960	+3,405	+0.94%	estimate
2017	369,703	+2,743	+0.75%	estimate
2018	370,548	+845	+0.23%	estimate
2019	368,242	-2,306	-0.62%	estimate
2020	371,849	+3,607	+0.98%	estimate
2021	365,041	-6,808	-1.83%	estimate
2022	367,947	+2,906	+0.80%	estimate
2023	370,398	+2,451	+0.67%	estimate
2024	373,875	+3,477	+0.94%	estimate

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

Under 5

4.6%

5–9

4.8%

10–14

5.5%

15–19

8.8%

20–24

12.2%

25–34

14.2%

35–44

11.9%

45–54

11.3%

55–59

5.5%

60–64

5.8%

65–74

9.2%

75–84

4.5%

85+

1.5%

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

Professional & business services

37.5%

Finance & real estate

13.0%

Manufacturing

12.4%

Education & health care

8.8%

Information

4.1%

Arts, entertainment & food

4.0%

Construction

3.5%

Retail trade

3.1%

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

Detroit (636,644)Grand Rapids (197,768)Warren (138,128)Sterling Heights (133,473)Ann Arbor (121,179)Lansing (112,546)Dearborn (107,846)Livonia (94,058)Troy (87,307)Westland (84,155)All Michigan cities →

Other counties in Michigan

Wayne County (1,773,767)Oakland County (1,272,294)Macomb County (877,624)Kent County (658,844)Genesee County (404,087)Ottawa County (298,614)Ingham County (282,015)Kalamazoo County (261,437)Livingston County (195,143)Saginaw County (189,210)All Michigan counties →

Part of Michigan

Michigan demographic profile All Michigan data →

Metro areas in Michigan

Detroit (4,367,620)Grand Rapids (1,154,320)Lansing (470,434)Flint (404,087)Ann Arbor (368,394)South Bend (324,180)Kalamazoo (261,437)Saginaw (189,210)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All 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.