The population of Marathon county is estimated at 135,195. In 2017 there were 1,605 births and 1,138 deaths in Marathon county. Marathon county has 26,068 housing units that are owned with a mortgage or a loan, 13,022 that are owned free and clear and 14,086 that are renter occupied.

  The residents of Marathon County filed 67,740 federal tax returns in 2017. This amount represents 2.4% of all Wisconsin filings and 0.045% of the entire nation. Marathon had a combined total federal tax liability of $645,320,000 on earned income of $4,160,145,000. Other notable statistics from Marathon County were 2,680 unemployment claims which collected a total of $8,531,000 and 14,820 charitable contributions valued at $61,164,000. 17,460 filings from Marathon County paid a combined total of $73,694,000 in property taxes and 13,980 filings paid $75,982,000 on mortgage interest costs.

  In 2010 Marathon county had 149 religious congregations with an estimated 86,961 members.
24.5% of the Marathon population has a college level Bachelors degree or higher. 8.2% have less than a highschool diploma level education.

Approximately 51% of Marathon County voted in the presidential election of 2016. This represents a decrease from the 2012 election by 788 votes.
At $59,302 the median income is 100.0% of the Wisconsin average. An estimated 2,193 people claimed to be unemployed last year in Marathon, the equivalant of around 3.0% of the county population. This represents a decrease in the level of unemployment from the previous year's value of 3.5%.

Top 15 Industries in Marathon County.
Total # Employed	Industry Job Type
14,472	Manufacturing
10,123	Health care and social assistance
9,545	Retail trade
4,458	Accommodation and food services
4,441	Finance and insurance
4,289	Fabricated metal product manufacturing
3,910	Food services and drinking places
3,471	Restaurants and other eating places
3,426	Ambulatory health care services
3,013	Insurance carriers and related activities
2,955	Wholesale trade
2,871	Architectural and structural metals manufacturing
2,413	Ornamental and architectural metal products manufacturing
2,402	Insurance carriers
2,392	Food manufacturing

In 2018 the average price reduction was 3.56% in Marathon County (averaging across 4 zip codes; 54455, 54476, 54401 and 54403).

In 2018 7.72% of listings in Marathon County (averaging across 4 zip codes; 54403, 54401, 54455 and 54476) dropped their price.

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