Marathon County, Wisconsin
Marathon County Courthouse in Wausau
Location within the U.S. state of Wisconsin
Wisconsin's location within the U.S.
|• Total||1,576 sq mi (4,080 km2)|
|• Land||1,545 sq mi (4,000 km2)|
|• Water||31 sq mi (80 km2) 2.0%%|
| • Estimate |
|• Density||85/sq mi (33/km2)|
|Time zone||UTC−6 ( Central)|
|• Summer ( DST)||UTC−5 ( CDT)|
Marathon County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 134,063.  Its county seat is Wausau.  It was founded in 1850,  created from a portion of Portage County. At that time the county stretched to the northern border with the upper Michigan peninsula. It is named after the battlefield at Marathon, Greece. 
According to the U.S. Census Bureau, the county has a total area of 1,576 square miles (4,080 km2), of which 1,545 square miles (4,000 km2) is land and 31 square miles (80 km2) (2.0%) is water.  It is the largest county in Wisconsin by land area and fourth-largest by total area. It is also notable for containing the 45°N, 90°W point.
|U.S. Decennial Census
1790–1960  1900–1990 
1990–2000  2010–2018 
As of the census  of 2000, there were 125,834 people, 47,702 households, and 33,868 families residing in the county. The population density was 81 people per square mile (31/km²). There were 50,360 housing units at an average density of 33 per square mile (13/km²). The racial makeup of the county was 93.84% White, 0.28% Black or African American, 0.35% Native American, 4.54% Asian, 0.02% Pacific Islander, 0.26% from other races, and 0.72% from two or more races. 0.78% of the population were Hispanic or Latino of any race. 52.6% were of German and 13.6% Polish ancestry. 92.9% spoke English, 3.4% Hmong, 1.1% German and 1.1% Spanish as their first language.
There were 47,702 households out of which 34.00% had children under the age of 18 living with them, 59.90% were married couples living together, 7.40% had a female householder with no husband present, and 29.00% were non-families. 23.60% of all households were made up of individuals and 9.50% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.11.
In the county, the population was spread out with 26.80% under the age of 18, 8.20% from 18 to 24, 29.50% from 25 to 44, 22.50% from 45 to 64, and 13.00% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 99.50 males. For every 100 females age 18 and over, there were 97.40 males.
In 2017, there were 1,451 births, giving a general fertility rate of 61.1 births per 1000 women aged 15–44, the 29th lowest rate out of all 72 Wisconsin counties. Of these, 32 of the births occurred at home. 
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Additionally, there were 52 reported induced abortions performed on women of Marathon County residence in 2017, a figure lower than the records for the preceding four years. 
The Marathon County Public Library ( MCPL) has its headquarters in downtown Wausau, Wisconsin. Eight branch libraries have been established in the cities of Athens, Edgar, Hatley, Marathon City, Mosinee, Rothschild, Spencer, and Stratford.
- Amco County Park
- Big Eau Pleine County Park
- Big Rapids County Park
- Bluegill Bay County Park
- Cherokee County Park
- Courthouse Square
- D.C. Everest County Park
- Dells of the Eau Claire County Park
- Duane L. Corbin Shooting Range Park
- Library Park
- Marathon Park
- Mission Lake County Park
- Mountain-Bay State Park Trail
- Reitbrock Geographical Marker
- Rib Falls County Park
- Sunny Vale County Park
There are over 884 miles of groomed snowmobile trails in Marathon County maintained by 29 area snowmobile clubs. 
- Abbotsford (mostly in Clark County)
- Colby (mostly in Clark County)
- Marshfield (mostly in Wood County)
- Wausau (county seat)
- Eau Pleine
- Green Valley
- Rib Falls
- Rib Mountain
- Gad (partial)
- Granite Heights
- Little Chicago
- Little Eau Claire
- Little Rose
- March Rapids
- Mount View
- Pike Lake
- Rib Falls
- Rocky Corners
- "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved January 22, 2014.
- "Find a County". National Association of Counties. Retrieved June 7, 2011.
- "Here's How Iron Got Its Name". The Rhinelander Daily News. June 16, 1932. p. 2. Retrieved August 24, 2014 – via Newspapers.com.
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved August 6, 2015.
- "Population and Housing Unit Estimates". Retrieved August 3, 2019.
- "U.S. Decennial Census". United States Census Bureau. Retrieved August 6, 2015.
- "Historical Census Browser". University of Virginia Library. Retrieved August 6, 2015.
- Forstall, Richard L., ed. (March 27, 1995). "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved August 6, 2015.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Retrieved August 6, 2015.
- "American FactFinder". United States Census Bureau. Archived from the original on 2020-02-12. Retrieved 2011-05-14.
- Annual Wisconsin Birth and Infant Mortality Report, 2017 P-01161-19 (June 2019): Detailed Tables
- Reported Induced Abortions in Wisconsin, Office of Health Informatics, Division of Public Health, Wisconsin Department of Health Services. Section: Trend Information, 2013-2017, Table 18, pages 17-18
- "Marathon County Parks, Recreation, Forestry Department". Marathon County, Wisconsin. Retrieved March 12, 2015.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved August 14, 2018.
|Wikisource has the text of an 1879 American Cyclopædia article about Marathon County, Wisconsin.|
- Marathon County
- Libraries and Schools in Marathon and Lincoln Counties - Digital collection of historic images and texts on schools and libraries in Marathon and Lincoln Counties