Demographics of Marathon County, Wisconsin

Marathon County, Wisconsin had 139,432 people on July 1, 2025, by the Census Bureau’s estimate: +1,313 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Marathon County, in four figures

139,432
Population: July 1, 2025, Vintage 2025 estimate.; +1.0%
Change since July 2020: +1,313 people.; 41.3 ±0.3
Median age: ACS 2020–⁠2024.; $77,884 ±$2,218
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Marathon County, Wisconsin's population grew 1.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Marathon County, Wisconsin's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Marathon County, Wisconsin's population grew 1.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Marathon County, Wisconsin's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	138,119	100.0	100.0
2021	137,832	99.8	100.2
2022	138,207	100.1	100.7
2023	138,768	100.5	101.6
2024	139,094	100.7	102.5
2025	139,432	101.0	103.1

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Population of Marathon County, Wisconsin on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	138,119	+56	+91	0	−68
2021	137,832	−287	−6	+31	−408
2022	138,207	+375	−90	+371	+198
2023	138,768	+561	−37	+307	+332
2024	139,094	+326	+82	+404	−150
2025	139,432	+338	+66	+206	+61

Age, 2020–2024

The median age is 41.3 ±0.3: for men 40.8 ±0.4 and for women 41.7 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Marathon County by age, ACS 2020–2024
Age	People	Share	Wisconsin	United States
Under 5	7,670 ±98	5.5% ±0.1	5.3% ±<0.1	5.6% ±<0.1
5 to 17	23,460 ±776	17.0% ±0.6	16.0% ±0.1	16.3% ±<0.1
18 to 24	10,139 ±516	7.3% ±0.4	9.3% ±0.1	9.1% ±<0.1
25 to 44	34,413 ±651	24.9% ±0.5	25.2% ±0.1	26.9% ±<0.1
45 to 64	36,168 ±750	26.1% ±0.5	25.6% ±0.1	24.8% ±<0.1
65 and over	26,553 ±879	19.2% ±0.6	18.5% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $77,884 ±$2,218, and income per person $41,413 ±$924, in 2024 dollars. The median is $77,485 ±$455 in Wisconsin and $80,734 ±$166 in the United States.

Households by income

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Households in Marathon County by income, ACS 2020–2024
Household income	Households	Share	Wisconsin	United States
Under $25,000	6,645 ±592	11.5% ±1.0	13.1% ±0.2	14.6% ±<0.1
$25,000 to $49,999	10,439 ±690	18.0% ±1.2	17.9% ±0.2	16.7% ±<0.1
$50,000 to $74,999	10,765 ±659	18.6% ±1.1	17.5% ±0.2	15.5% ±<0.1
$75,000 to $99,999	8,580 ±549	14.8% ±0.9	13.8% ±0.2	12.6% ±<0.1
$100,000 to $149,999	11,828 ±712	20.4% ±1.2	19.1% ±0.2	17.5% ±<0.1
$150,000 to $199,999	5,208 ±423	9.0% ±0.7	9.4% ±0.1	9.6% ±<0.1
$200,000 or more	4,401 ±387	7.6% ±0.7	9.2% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Marathon County by age, ACS 2020–2024
Age	Below poverty	Rate	Wisconsin	United States
All ages	11,887 ±1,112	8.7% ±0.8	10.6% ±0.1	12.5% ±0.1
Under 18	3,370 ±490	11.1% ±1.6	12.8% ±0.3	16.1% ±0.1
18 to 59	5,393 ±555	7.7% ±0.8	10.3% ±0.2	11.6% ±0.1
60 and over	3,124 ±397	8.6% ±1.1	9.3% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Marathon County, ACS 2020–2024
Measure	Marathon County	Wisconsin	United States
Housing units	60,910 ±126	2,778,572 ±1,533	143,775,355 ±10,234
Occupied	95.0% ±0.6	89.2% ±0.2	89.9% ±0.1
Vacant	5.0% ±0.6	10.8% ±0.2	10.1% ±0.1
Owner occupied	73.3% ±1.0	67.8% ±0.3	65.2% ±0.3
Renter occupied	26.7% ±1.2	32.2% ±0.2	34.8% ±0.1
Median home value	$219,600 ±$3,992	$266,500 ±$1,051	$332,700 ±$236
Median gross rent	$999 ±$28	$1,087 ±$4	$1,413 ±$2
Median year built	1978 ±2	1975 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Marathon County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Wisconsin	United States
Hispanic or Latino	4,893 ±0	3.5% ±<0.1	8.0% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	119,281 ±410	86.2% ±0.3	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	800 ±239	0.6% ±0.2	5.9% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	7,842 ±300	5.7% ±0.2	2.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	66 to 206	< 0.1% to 0.1%	0.5% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 59	0% to < 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	131 to 819	0.1% to 0.6%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	4,951 ±485	3.6% ±0.4	3.7% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Marathon County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Wisconsin	United States
Born in the state	106,874 ±1,271	77.2% ±0.9	70.3% ±0.1	57.3% ±<0.1
Born in another state	24,850 ±1,132	18.0% ±0.8	23.6% ±0.1	26.9% ±<0.1
Born a citizen outside the states	670 ±194	0.5% ±0.1	0.9% ±<0.1	1.7% ±<0.1
Born abroad	6,009 ±626	4.3% ±0.5	5.2% ±0.1	14.1% ±<0.1
Naturalized citizens	3,387 ±389	2.4% ±0.3	2.5% ±0.1	7.4% ±<0.1
Not citizens	2,622 ±538	1.9% ±0.4	2.7% ±0.1	6.8% ±<0.1

Marathon County among the counties of Wisconsin

10th of 72 by population, July 2025. Every one is listed on the Wisconsin page.

Counties of Wisconsin near Marathon County in population, July 2025
County	July 2025	Change since 2020
Racine County	198,919	+0.4%
Outagamie County	195,894	+2.6%
Winnebago County	174,218	+1.4%
Kenosha County	168,448	−0.4%
Rock County	166,472	+1.7%
Marathon County	139,432	+1.0%
Washington County	139,238	+1.8%
La Crosse County	121,339	+0.3%
Sheboygan County	118,047	< +0.1%
Eau Claire County	109,033	+3.0%
Walworth County	106,127	+0.8%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026