Marathon County Population

1850–2026

139.77K

2026 projection

1.2% since 2020 (increase)

020K40K60K80K100K120K140K186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Marathon County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026139,770+3380.24%
2025139,432+3380.24%
2024139,094+3260.23%
2023138,768+5610.41%
2022138,207+3750.27%
2021137,832-2870.21%
2020138,119+2,4221.78%
2019135,697+2190.16%
2018135,478-470.03%
2017135,525+3930.29%

Showing 10 of 32 years.

Marathon County Demographics

41.3median age

Median age

Female41.7 yrs
Male40.8 yrs

Adults

107,273
26,553 seniors (65+) · 25% of adults80,720 other adults

Sex

Female 49.5% · 68,553Male 50.5% · 69,850

Population by age

MaleFemale85+ years, male: 1,15385+ years, female: 2,15680–84 years, male: 1,47480–84 years, female: 1,90175–79 years, male: 2,19275–79 years, female: 2,13370–74 years, male: 3,03170–74 years, female: 3,39065–69 years, male: 4,68865–69 years, female: 4,43560–64 years, male: 5,23160–64 years, female: 5,10955–59 years, male: 4,73555–59 years, female: 4,43550–54 years, male: 4,48650–54 years, female: 4,20545–49 years, male: 4,15245–49 years, female: 3,81540–44 years, male: 4,51140–44 years, female: 4,55635–39 years, male: 4,51035–39 years, female: 4,23230–34 years, male: 4,31830–34 years, female: 4,10725–29 years, male: 4,26725–29 years, female: 3,91220–24 years, male: 3,79420–24 years, female: 3,59415–19 years, male: 4,48515–19 years, female: 4,08610–14 years, male: 4,98110–14 years, female: 4,2535–9 years, male: 4,0365–9 years, female: 4,3700–4 years, male: 3,8060–4 years, female: 3,86485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K4K4K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 1,384 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Marathon County Income

$77,884median household income

Median household income

$77,884

Half of households earn more, half earn less

Median earnings

$51,449

Typical yearly pay for a worker 25 or older.

Poverty rate

8.7%

About 1 in 11 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Marathon County Marital Status

54% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married54%55%54%
Never married29%33%25%
Divorced11%10%12%
Widowed5%3%8%
Separated<1%<1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year