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
The poverty rate is what most separates Washington County from the typical county: 3.5% of residents live below the federal poverty line, against 12.4% nationally. Washington County is a county in Wisconsin with a population of 137,320. It ranks #11 among counties in Wisconsin by population.
Earnings sit at the high end: a median household income of $95,851, above the US median of $78,538. Poverty is among the lowest of comparable US counties, at 3.5% — below the national 12.4%. A typical home is worth $316,200, with typical rent around $1,126.
Educational attainment is on the higher side for US counties — 34.8% of adults hold a four-year degree, near the national 35.0%. A solid 12.4% of workers are based at home, below the national 14.0%, and the average commute runs about 26 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.