Eau Claire County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 105,710. Its county seat is Eau Claire. The county took its name from the Eau Claire River.

Eau Claire County is included in the Eau Claire, WI Metropolitan Statistical Area as well as the Eau Claire-Menomonie WI Combined Statistical Area.

Eau Claire county was originally set off as the Town of Clearwater in Chippewa County in 1855. The name was changed to the Town of Eau Claire on March 31, 1856. The entire town was separated as Eau Claire County by an act of the Wisconsin State Legislature on October 6, 1856.

According to the U.S. Census Bureau, the county has a total area of 645 square miles (1,670 km), of which 638 square miles (1,650 km) is land and 7.3 square miles (19 km) (1.1%) is water.

• Chippewa County – north
• Clark County – east
• Jackson County – southeast
• Trempealeau County – south
• Buffalo County – southwest
• Pepin County – west
• Dunn County – west

Historical population

Census	Pop.	Note	%±
1860	3,162		—
1870	10,769		240.6%
1880	19,993		85.7%
1890	30,673		53.4%
1900	31,692		3.3%
1910	32,721		3.2%
1920	35,771		9.3%
1930	41,087		14.9%
1940	46,999		14.4%
1950	54,187		15.3%
1960	58,300		7.6%
1970	67,219		15.3%
1980	78,805		17.2%
1990	85,183		8.1%
2000	93,142		9.3%
2010	98,736		6.0%
2020	105,710		7.1%
U.S. Decennial Census 1790–1960 1900–1990 1990–2000 2010 2020

As of the census of 2020, the population was 105,710. The population density was 165.7 people per square mile (64.0 people/km). There were 44,966 housing units at an average density of 70.5 units per square mile (27.2 units/km). The racial makeup of the county was 88.2% White, 4.2% Asian, 1.2% Black or African American, 0.5% Native American, 0.1% Pacific Islander, 1.1% from other races, and 4.7% from two or more races. Ethnically, the population was 2.9% Hispanic or Latino of any race.

As of the census of 2000, there were 93,142 people, 35,822 households, and 22,281 families residing in the county. The population density was 146 people per square mile (56 people/km). There were 37,474 housing units at an average density of 59 units per square mile (23 units/km). The racial makeup of the county was 94.96% White, 0.52% Black or African American, 0.54% Native American, 2.52% Asian, 0.03% Pacific Islander, 0.33% from other races, and 1.11% from two or more races. 0.94% of the population were Hispanic or Latino of any race. 37.4% were of German, 21.5% Norwegian and 7.0% Irish ancestry. 94.2% spoke English, 1.6% Hmong, 1.6% Spanish and 1.0% German as their first language.

There were 35,822 households, out of which 30.00% had children under the age of 18 living with them, 50.60% were married couples living together, 8.60% had a female householder with no husband present, and 37.80% were non-families. 27.10% of all households were made up of individuals, and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.02.

In the county, the population was spread out, with 23.40% under the age of 18, 17.10% from 18 to 24, 26.70% from 25 to 44, 20.50% from 45 to 64, and 12.20% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 93.80 males. For every 100 females age 18 and over, there were 90.60 males.

In 2017, there were 1,191 births, giving a general fertility rate of 52.8 births per 1000 women aged 15–44, the tenth lowest rate out of all 72 Wisconsin counties. Of these, 99 of the births occurred at home, the third highest for Wisconsin counties.

In 2010, the largest religious groups by reported number of adherents were Catholic at 16,240 adherents, ELCA Lutheran at 15,067 adherents, Missouri Synod Lutheran at 6,953 adherents, LCMC Lutheran at 3,355 adherents, United Methodist at 2,177 adherents, non-denominational Christian at 1,557 adherents, Lutheran Brethren at 1,391 adherents, United Church of Christ at 1,046 adherents, Assemblies of God at 969 adherents, Amish at 794 adherents, Wisconsin Synod Lutheran at 757 adherents, ELS Lutheran at 708 adherents, and LDS (Mormon) at 703 adherents.

• Union Pacific

• Eau Claire Transit

Eau Claire county is served by the Chippewa Valley Regional Airport (KEAU).

The legislative body of Eau Claire County is the non-partisan 29-member Eau Claire County Board of Supervisors. Members of the board of supervisors are elected by district and the chairperson and vice-chair positions are elected from within members of the board.

The board meets in the Eau Claire County Courthouse in downtown Eau Claire, with its weekly meetings televised on local public television and transcripts published online. Most items are approved on a "consent calendar" without discussion. Public comment is limited to three minutes per individual per item.

Eau Claire County contains portions of the Wisconsin State Senate districts 23 and 31, represented by Kathy Bernier (R) and Jeff Smith (D) respectively. It also contains portions of Wisconsin State Assembly districts 68 (Jesse James [R]) and 93 (Warren Petryk [R]), as well as almost all of district 91 (Jodi Emerson [D]). At the federal level, the entire county is contained within Wisconsin's third congressional district, which is represented in the United States House of Representatives by Derrick Van Orden (R). At the Presidential level Eau Claire is solidly Democratic, having last voted Republican in 1984 for Ronald Reagan in his landslide re-election. Since 1984 the closest a Republican has come to winning Eau Claire was in 2000 when George W. Bush lost the county by 6.6 percent.

United States presidential election results for Eau Claire County, Wisconsin

Year	Republican		Democratic		Third party(ies)
	No.	%	No.	%	No.	%
2020	25,341	43.49%	31,620	54.26%	1,314	2.25%
2016	23,331	42.40%	27,340	49.69%	4,354	7.91%
2012	23,256	42.43%	30,666	55.95%	884	1.61%
2008	20,959	38.10%	33,146	60.25%	905	1.65%
2004	24,653	44.47%	30,068	54.24%	716	1.29%
2000	20,921	43.70%	24,078	50.29%	2,876	6.01%
1996	13,900	34.41%	20,298	50.26%	6,192	15.33%
1992	15,915	33.81%	21,221	45.08%	9,940	21.11%
1988	17,664	45.27%	21,150	54.20%	209	0.54%
1984	20,401	51.09%	19,347	48.45%	181	0.45%
1980	17,304	44.46%	17,602	45.22%	4,016	10.32%
1976	16,388	46.36%	18,263	51.66%	702	1.99%
1972	15,883	51.33%	14,300	46.21%	760	2.46%
1968	11,799	46.66%	12,302	48.65%	1,186	4.69%
1964	8,700	35.48%	15,775	64.33%	46	0.19%
1960	14,427	56.13%	11,240	43.73%	37	0.14%
1956	13,122	58.48%	9,276	41.34%	41	0.18%
1952	14,069	59.47%	9,554	40.38%	35	0.15%
1948	7,825	43.37%	9,971	55.27%	246	1.36%
1944	9,470	51.13%	8,962	48.39%	88	0.48%
1940	9,595	48.38%	10,129	51.07%	108	0.54%
1936	6,802	39.41%	10,065	58.31%	393	2.28%
1932	7,487	48.80%	7,565	49.31%	291	1.90%
1928	10,079	69.25%	4,385	30.13%	91	0.63%
1924	5,149	46.46%	629	5.68%	5,305	47.87%
1920	7,856	81.62%	1,193	12.39%	576	5.98%
1916	2,922	53.00%	2,290	41.54%	301	5.46%
1912	2,013	40.29%	1,727	34.57%	1,256	25.14%
1908	3,981	64.50%	1,859	30.12%	332	5.38%
1904	4,343	73.08%	1,224	20.60%	376	6.33%
1900	4,378	66.44%	1,967	29.85%	244	3.70%
1896	4,522	63.42%	2,364	33.16%	244	3.42%
1892	2,719	47.80%	2,383	41.90%	586	10.30%

Attractions include the Chippewa Valley Museum in Eau Claire, Dells Mill Museum in Augusta, Dells Mill Water Powered Museum in Augusta, the Paul Bunyan Logging Camp in Eau Claire, and the Sarge Boyd Bandshell in Eau Claire.

• Altoona
• Augusta
• Eau Claire (county seat; partly in Chippewa County)

• Fairchild
• Fall Creek

• Seymour

• Hadleyville
• Nelsonville
• Oak Grove
• Porter's Mills
• Shawtown

Footnotes

Historical community
Now part of the City of Eau Claire

• National Register of Historic Places listings in Eau Claire County, Wisconsin

• Bailey, William F. (ed.). History of Eau Claire County, Wisconsin, Past and Present. Chicago: C. F. Cooper, 1914.

• Official website
• Old plat maps: 1878 1899-1900 1902 1910 1931 1945
• Eau Claire County map from the Wisconsin Department of Transportation
• History of Eau Claire County Archived August 5, 2012, at the Wayback Machine
• University of Wisconsin-Eau Claire, Special Collections and Archives Archived August 11, 2014, at the Wayback Machine
• Chippewa Valley Museum

44°44′N 91°17′W / 44.73°N 91.29°W / 44.73; -91.29