• county
  • FIPS 55131
  • Largest town: West Bend

Washington County, Wisconsin

Washington County had 138,727 residents in the Census Vintage 2024 estimate, on 430.6 square miles of land. It ranks 11th of 72 in Wisconsin by population and 63rd by land area.

Population
138,727
#11 of 72 in Wisconsin · #482 in US
Area
430.6 sq mi
#63 of 72 in Wisconsin · #2,363 in US
Density
322 / sq mi
#9 of 72 in Wisconsin · #411 in US
Median household income
$93,830
#5 of 72 in Wisconsin · #196 in US

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

Washington County within Wisconsin. Pin: Madison.

Measure from here

Tools and pages that start from Washington County

Washington County population, land area and income

Washington County had 138,727 residents in the Census Vintage 2024 estimate, on 430.6 square miles of land. It ranks 11th of 72 in Wisconsin by population and 63rd by land area. That works out to 322.1 people per square mile, 3.3 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Wisconsin has 41,821 residents, so Washington County is 3.3 times that size.

Its SAIPE 2023 median household income of $93,830 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

138,727

3144th1st

482nd of 3,144 (US)

Land area

431 sq mi

3144th1st

2363rd of 3,144 (US)

Density

322.1 / sq mi

3144th1st

411th of 3,144 (US)

Median household income

$93,830

3143rd1st

196th of 3,143 (US)

Rank within Wisconsin (72)

Population

138,727

72nd1st

11th of 72 (WI)

Land area

431 sq mi

72nd1st

63rd of 72 (WI)

Density

322.1 / sq mi

72nd1st

9th of 72 (WI)

Median household income

$93,830

72nd1st

5th of 72 (WI)

How Washington County's population changed since 2020

Washington County gained 1,916 residents between the July 2020 and July 2024 estimates, a rise of 1.4%. That ranks 29th of 72 in Wisconsin for growth. The median Wisconsin county changed by +1.0%, and the state as a whole by +1.1%.

Since the April 2020 estimates base, Washington County recorded 5,290 births and 5,811 deaths, a natural change of -521. Net international migration added +423 and net domestic migration, people moving to or from other US counties, came to +2,061. The largest single component was domestic migration, which added 2,061 people.

136.8k2020137.4k2021138.0k2022138.5k2023138.7k2024
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
5,290
Deaths
5,811
Net international migration
+423
Net domestic migration
+2,061
Change, July 2023 to July 2024
+231

Where Washington County is

The Census internal point of Washington County is at 43.391200, -88.232900. It sits in UTM zone 16N. The map shades Wisconsin's 72 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Washington County outlined. Dots are towns of 1,000+ people with residents in it.

Barron County: +0.2%Green County: +0.4%Dunn County: +1.5%Jefferson County: +0.0%Lincoln County: +0.1%Rusk County: -0.1%Fond du Lac County: +0.1%Marquette County: +1.0%Outagamie County: +2.3%Waupaca County: -1.2%Oneida County: +0.8%Eau Claire County: +2.8%Washington County: +1.4%Portage County: +2.3%Menominee County: +0.7%Clark County: +0.5%Monroe County: +0.2%Milwaukee County: -1.5%Buffalo County: +1.1%Lafayette County: +4.2%Ozaukee County: +2.5%Rock County: +1.0%Sheboygan County: +0.2%Green Lake County: +1.8%Waukesha County: +2.3%Calumet County: +2.1%Dodge County: -0.8%Wood County: -0.3%Winnebago County: +0.9%Sawyer County: +4.0%Dane County: +4.6%Sauk County: +1.1%Pepin County: +2.9%Adams County: +3.2%Price County: +0.4%Taylor County: +1.1%Grant County: +0.7%Trempealeau County: -0.0%Vernon County: +2.1%Waushara County: +2.2%Iowa County: +1.0%Crawford County: -0.5%Kenosha County: -0.3%Shawano County: +1.1%Juneau County: -0.7%Jackson County: -0.3%Vilas County: +3.7%Bayfield County: +3.7%Chippewa County: +1.5%Iron County: +1.5%Racine County: +0.3%Door County: +1.3%Ashland County: +1.1%Kewaunee County: +0.9%Polk County: +1.8%Florence County: +2.4%Douglas County: -0.2%Forest County: +3.7%Columbia County: -0.7%Walworth County: +0.7%La Crosse County: +0.1%Manitowoc County: +0.1%Oconto County: +2.5%Langlade County: +0.4%Marathon County: +0.7%Washburn County: +2.2%Brown County: +1.8%Richland County: -0.9%Marinette County: +1.1%St. Croix County: +4.3%Pierce County: +2.7%Burnett County: +3.7%
Change 2020 to 2024
  1. < +0.1%
  2. < +0.7%
  3. < +1.3%
  4. < +2.3%
  5. ≥ +2.3%
no data

Orange pin: Washington County internal point. Dark pin: Madison.

Internal point

Decimal
43.391200, -88.232900
DMS
43°23'28.32"N 88°13'58.44"W
UTM
16N 400147.8E 4804996.5N
Geohash
dp9qb5nu0
Plus code
86MH9QR8+FR

Towns in Washington County

8 incorporated places of 1,000+ people have residents in Washington County, 101,152 people together, or 73% of the county. Each figure counts only the part of the town inside Washington County; towns marked "part" extend into another county. The largest is West Bend with 32,149.

  1. 01West Bend32,149
  2. 02Germantown21,032
  3. 03Hartford (part)15,973
  4. 04Richfield11,783
  5. 05Jackson8,169
  6. 06Slinger6,443
  7. 07Kewaskum4,564
  8. 08Newburg (part)1,039
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Washington County

The Census 2024 county adjacency file lists 6 neighbors for Washington County. The most populous is Milwaukee County, WI, with 924,740 residents. Distances run between Census internal points in a straight line.

Distance to Madison and the nearest big city

Madison is 61.9 miles WSW of Washington County's internal point in a straight line. The nearest place of 100,000 or more is Milwaukee, WI (population 563,531), 26.3 miles away. The nearest place of 10,000 or more is West Bend, WI (population 32,149), 3.2 miles away.

Washington County FIPS code

The FIPS code of Washington County is 55131: state code 55 for Wisconsin plus county code 131. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $93,830.

Questions people ask

What is the population of Washington County, Wisconsin?

The Census Vintage 2024 estimate for July 1, 2024 is 138,727. That is up 1,916 people (1.4%) from the July 2020 estimate of 136,811.

What is the FIPS code of Washington County?

55131. The first two digits (55) are Wisconsin; the last three (131) identify the county.

What is the largest town in Washington County?

West Bend, with 32,149 residents inside Washington County in 2024.

Which counties border Washington County?

6 county-equivalents border it in the Census 2024 adjacency file: Milwaukee County, WI; Waukesha County, WI; Sheboygan County, WI; Fond du Lac County, WI; Ozaukee County, WI; Dodge County, WI.

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.