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Marathon County is a county located in central Wisconsin. As of the 2020 census, the population was 138,013. The county seat is Wausau. Marathon County was created in 1850 and is named after the Marathon race of ancient Greece. The county is known for its many lakes, rivers, and outdoor recreational opportunities, including the Marathon County Parks, the Eau Claire River, and the Ice Age Trail. The county is home to the city of Wausau, which is the county’s largest city and the regional center for commerce, industry, healthcare, and education. The county also has several small towns and communities, including Mosinee, Rothschild, and Edgar. The county has a diverse economy, with healthcare, manufacturing, and service industries being the main drivers.