• county
  • FIPS 26161
  • Largest town: Ann Arbor

Washtenaw County, Michigan

Washtenaw County had 373,875 residents in the Census Vintage 2024 estimate, on 706.0 square miles of land. It ranks 6th of 83 in Michigan by population and 27th by land area.

Population
373,875
#6 of 83 in Michigan · #207 in US
Area
706.0 sq mi
#27 of 83 in Michigan · #1,309 in US
Density
530 / sq mi
#7 of 83 in Michigan · #268 in US
Median household income
$84,704
#5 of 83 in Michigan · #335 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Washtenaw County within Michigan. Pin: Lansing.

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Washtenaw County population, land area and income

Washtenaw County had 373,875 residents in the Census Vintage 2024 estimate, on 706.0 square miles of land. It ranks 6th of 83 in Michigan by population and 27th by land area. That works out to 529.6 people per square mile, 5.5 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Michigan has 38,041 residents, so Washtenaw County is 9.8 times that size.

Its SAIPE 2023 median household income of $84,704 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

373,875

3144th1st

207th of 3,144 (US)

Land area

706 sq mi

3144th1st

1309th of 3,144 (US)

Density

529.6 / sq mi

3144th1st

268th of 3,144 (US)

Median household income

$84,704

3143rd1st

335th of 3,143 (US)

Rank within Michigan (83)

Population

373,875

83rd1st

6th of 83 (MI)

Land area

706 sq mi

83rd1st

27th of 83 (MI)

Density

529.6 / sq mi

83rd1st

7th of 83 (MI)

Median household income

$84,704

83rd1st

5th of 83 (MI)

How Washtenaw County's population changed since 2020

Washtenaw County gained 2,026 residents between the July 2020 and July 2024 estimates, a rise of 0.5%. That ranks 50th of 83 in Michigan for growth. The median Michigan county changed by +0.9%, and the state as a whole by +0.7%.

Since the April 2020 estimates base, Washtenaw County recorded 13,742 births and 10,987 deaths, a natural change of +2,755. Net international migration added +15,504 and net domestic migration, people moving to or from other US counties, came to -16,148. The largest single component was domestic migration, which removed 16,148 people.

371.8k2020365.0k2021367.9k2022370.4k2023373.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
13,742
Deaths
10,987
Net international migration
+15,504
Net domestic migration
-16,148
Change, July 2023 to July 2024
+3,477

Where Washtenaw County is

The Census internal point of Washtenaw County is at 42.252200, -83.843400. It sits in UTM zone 17N. The map shades Michigan's 83 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Washtenaw County outlined. Dots are towns of 1,000+ people with residents in it.

Calhoun County: -0.3%Benzie County: +2.9%Newaygo County: +2.8%Antrim County: +4.6%Montcalm County: +4.0%Kalamazoo County: +1.1%Isabella County: +0.9%Ingham County: +1.9%Jackson County: +0.0%Kent County: +2.2%Oceana County: +1.1%Roscommon County: +2.0%Clare County: +1.8%Gladwin County: +2.5%Branch County: +2.9%Iosco County: +0.7%Bay County: -1.1%Shiawassee County: -0.0%Ionia County: -1.0%Otsego County: +3.8%Alcona County: +4.3%Missaukee County: +1.1%Crawford County: +4.7%Lapeer County: +0.7%Arenac County: +0.5%Gogebic County: -0.9%Marquette County: +2.2%Alpena County: +0.1%Lenawee County: -1.6%Berrien County: -1.1%Leelanau County: +2.5%Clinton County: +1.1%Alger County: -1.6%Gratiot County: -0.8%St. Joseph County: +0.4%Van Buren County: +0.7%Dickinson County: +0.3%Charlevoix County: +0.3%Sanilac County: -0.5%Wexford County: +2.3%Houghton County: +2.1%Saginaw County: -1.1%Kalkaska County: +3.8%Ottawa County: +3.1%Presque Isle County: +1.8%Eaton County: +0.3%Barry County: +2.3%Lake County: +7.5%Cheboygan County: +1.5%Wayne County: -1.0%Macomb County: +0.7%Oscoda County: +4.4%Emmet County: -0.5%Ontonagon County: +0.4%Schoolcraft County: +1.5%Monroe County: +0.7%Tuscola County: -1.0%Luce County: -1.3%Menominee County: -1.7%Mason County: +0.2%Muskegon County: +1.5%Baraga County: +0.3%Genesee County: -0.9%Grand Traverse County: +1.3%Washtenaw County: +0.5%Huron County: -1.9%Cass County: -0.0%Delta County: -0.5%Montmorency County: +7.2%Oakland County: +1.9%Chippewa County: -1.5%Keweenaw County: +5.0%Hillsdale County: -0.3%Manistee County: +1.8%Allegan County: +1.5%Mecosta County: +3.8%Iron County: +0.8%Osceola County: +2.5%St. Clair County: -0.1%Livingston County: +1.5%Ogemaw County: +1.0%Midland County: +0.6%Mackinac County: +3.1%
Change 2020 to 2024
  1. < -0.5%
  2. < +0.5%
  3. < +1.5%
  4. < +2.5%
  5. ≥ +2.5%
no data

Orange pin: Washtenaw County internal point. Dark pin: Lansing.

Internal point

Decimal
42.252200, -83.843400
DMS
42°15'7.92"N 83°50'36.24"W
UTM
17N 265439.1E 4681693.5N
Geohash
dps2k5g0g
Plus code
86JR7524+VJ

Towns in Washtenaw County

7 incorporated places of 1,000+ people have residents in Washtenaw County, 167,943 people together, or 45% of the county. Each figure counts only the part of the town inside Washtenaw County; towns marked "part" extend into another county. The largest is Ann Arbor with 122,925.

  1. 01Ann Arbor122,925
  2. 02Ypsilanti20,150
  3. 03Saline9,101
  4. 04Chelsea5,393
  5. 05Dexter4,528
  6. 06Milan (part)3,790
  7. 07Manchester2,056
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Washtenaw County

The Census 2024 county adjacency file lists 6 neighbors for Washtenaw County. The most populous is Wayne County, MI, with 1,771,063 residents. Distances run between Census internal points in a straight line.

Distance to Lansing and the nearest big city

Lansing is 49.2 miles NW of Washtenaw County's internal point in a straight line. The nearest place of 100,000 or more is Ann Arbor, MI (population 122,925), 6.0 miles away.

Washtenaw County FIPS code

The FIPS code of Washtenaw County is 26161: state code 26 for Michigan plus county code 161. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $84,704.

Questions people ask

What is the population of Washtenaw County, Michigan?

The Census Vintage 2024 estimate for July 1, 2024 is 373,875. That is up 2,026 people (0.5%) from the July 2020 estimate of 371,849.

What is the FIPS code of Washtenaw County?

26161. The first two digits (26) are Michigan; the last three (161) identify the county.

What is the largest town in Washtenaw County?

Ann Arbor, with 122,925 residents inside Washtenaw County in 2024.

Which counties border Washtenaw County?

6 county-equivalents border it in the Census 2024 adjacency file: Wayne County, MI; Oakland County, MI; Livingston County, MI; Jackson County, MI; Monroe County, MI; Lenawee County, MI.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.