Washington County, Wisconsin Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 11th-largest in Wisconsin
The population of Washington County, Wisconsin is 137,320 as of the 2023 American Community Survey, making it the 11th-largest county in Wisconsin. The median household income is $95,851, the median home value is $316,200, and the median age is 43.5.
The population of Washington County has grown 5.1% since 2010 (131,990 → 138,727), a +0.36% annualized rate.
137,320
Population
+0.36%
Annual growth
319
People / sq mi
$95,851
Median Income
$316,200
Median Home Value
Washington County covers 431 sq mi of land at 318.9 people per square mile.
About Washington County, WI
Washington County is a county in Wisconsin with a population of 137,320. It ranks #11 among counties in Wisconsin by population. The median age is 43.5, older than the national median. The population is 50.1% male and 49.9% female.
The median household income in Washington County is $95,851, above the US median of $74,580. 3.5% of residents live below the federal poverty level. Home values sit at a median of $316,200, with monthly rent averaging $1,126. The homeownership rate of 78.1% is higher than the national rate of 64.8%.
Educational attainment in Washington County reflects 34.8% of adults 25 and older holding a bachelor's degree or higher, near the national average of 34.3%. Roughly 12.4% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 25.8 minutes each way.
Washington County Population History (2010-2024)
The county of Washington County had a population of 131,990 in 2010 and 138,727 in 2024, a 5.1% growth over 14 years. The peak was 138,727 in 2024. Average annual growth rate: 0.36%.
138,727
Population (2024)
131,990
Population (2010)
138,727
Peak (2024)
0.36%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 131,990 |
| 2011 | 132,341 |
| 2012 | 132,743 |
| 2013 | 132,938 |
| 2014 | 133,610 |
| 2015 | 133,920 |
| 2016 | 134,324 |
| 2017 | 134,961 |
| 2018 | 135,615 |
| 2019 | 136,302 |
| 2020 | 136,811 |
| 2021 | 137,361 |
| 2022 | 137,999 |
| 2023 | 138,496 |
| 2024 | 138,727 |
Race & Ethnicity
| White | 92.1% |
| Black or African American | 1.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Age & Sex
43.5
Median Age
49.9%
Female
50.1%
Male
19.2%
Age 65+
Age Distribution
Children (under 15): 17.1% · Seniors (65+): 19.2%
Income & Poverty
| Median household income | $95,851+$20,181 vs state |
| Mean household income | $115,147 |
| Per-capita income | $48,255 |
| Poverty rate | 3.5%-3.1% vs state |
| Unemployment rate | 1.9% |
| Employment-to-population | 67.1% |
Top Industries by Employment
The largest employment sector in Washington County is manufacturing, accounting for 22.6% of workers.
How residents commute
0.2%
Drive alone
1.0%
Carpool
79.4%
Public transit
12.4%
Work from home
25.8 min
Avg commute
Housing
$316,200+$68,800 vs state
Median home value
$1,126
Median rent
78.1%
Homeownership rate
58,766
Total housing units
96.1%
Occupied
3.9%
Vacant
21.9%
Renter-occupied
Social & access
96.9%
With health insurance
94.9%
With broadband internet
15.1%
Foreign-born
6.9%
Veterans (18+)
9.8%
With a disability
96.0%
Speak language other than English at home
Education
95.6%
High School+
34.8%
Bachelor's+
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County rankings
Frequently Asked Questions
Washington County, Wisconsin has a population of 137,320 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 11th-largest county in Wisconsin. Population density is 319 people per square mile.
The population of Washington County has grown 5.1% since 2010 (131,990 → 138,727), a +0.36% annualized rate.
The median household income in Washington County, Wisconsin is $95,851, with mean (average) household income of $115,147 and per-capita income of $48,255. 3.5% of residents live below the federal poverty level.
In Washington County, the largest racial and ethnic groups are White (92.1%), Black or African American (1.6%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Washington County, Wisconsin is 43.5 years. Residents are 49.9% female and 50.1% male.
The median home value in Washington County is $316,200 and median monthly rent is $1,126. 78.1% of occupied housing units are owner-occupied. The county has 58,766 total housing units, 3.9% of which are vacant.
The largest employment sector in Washington County, Wisconsin is manufacturing, employing 22.6% of workers. The unemployment rate is 1.9%.
Milwaukee is among the largest cities associated with Washington County, Wisconsin, with a population of 569,756.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.