Last official estimated population of Marathon County was 134,065 (year 2014)[1]. This was 0.042% of total US population and 2.3% of total Wisconsin state population. Area of Marathon County is 1,576.3 mi² (=4082.7 km²), in this year population density was 85.05 p/mi². If population growth rate would be same as in period 2010-2014 (+0%/yr), Marathon County population in 2026 would be 134,071 [0].
Historical population of Marathon County for period 1850-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1850-1860] +19 %/yr
[1860-1870] +7.36 %/yr
[1870-1880] +11.27 %/yr
[1880-1890] +5.9 %/yr
[1890-1900] +3.6 %/yr
[1900-1910] +2.44 %/yr
[1910-1920] +1.72 %/yr
[1920-1930] +0.79 %/yr
[1930-1940] +0.72 %/yr
[1940-1950] +0.57 %/yr
[1950-1960] +1.02 %/yr
[1960-1970] +0.93 %/yr
[1970-1980] +1.33 %/yr
[1980-1990] +0.37 %/yr
[1990-2000] +0.88 %/yr
[2000-2005] +0.48 %/yr
[2005-2010] +0.78 %/yr
[2010-2014] +0 %/yr
Looking for settlements in Marathon County? Visit this page: Settlements in Marathon County, WI
Population of Marathon County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4281 | 3962 | 8,243 |
| 5 to 9 | 4573 | 4346 | 8,919 |
| 10 to 14 | 4672 | 4347 | 9,019 |
| 15 to 19 | 4516 | 4150 | 8,666 |
| 20 to 24 | 4165 | 3796 | 7,961 |
| 25 to 29 | 3900 | 3713 | 7,613 |
| 30 to 34 | 4356 | 4274 | 8,630 |
| 35 to 39 | 4150 | 3844 | 7,994 |
| 40 to 44 | 4299 | 4142 | 8,441 |
| 45 to 49 | 4776 | 4657 | 9,433 |
| 50 to 54 | 5357 | 5268 | 10,625 |
| 55 to 59 | 5086 | 4900 | 9,986 |
| 60 to 64 | 4333 | 4308 | 8,641 |
| 65 to 69 | 3277 | 3352 | 6,629 |
| 70 to 74 | 2436 | 2635 | 5,071 |
| 75 to 79 | 1737 | 2071 | 3,808 |
| 80 to 84 | 1237 | 1650 | 2,887 |
| 85+ | 1129 | 2085 | 3,214 |
Marathon County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 66472 | 65833 | 132,305 |
| WAC | 63108 | 62807 | 125,915 |
| WA | 62233 | 62008 | 124,241 |
| NHWAC | 61508 | 61308 | 122,816 |
| NHWA | 60724 | 60579 | 121,303 |
| AAC | 4321 | 4058 | 8,379 |
| NHAAC | 4259 | 4021 | 8,280 |
| AA | 3987 | 3774 | 7,761 |
| NHAA | 3945 | 3751 | 7,696 |
| H | 1808 | 1667 | 3,475 |
| HWAC | 1600 | 1499 | 3,099 |
| HWA | 1509 | 1429 | 2,938 |
| BAC | 1072 | 799 | 1,871 |
| TOM | 945 | 845 | 1,790 |
| NHBAC | 977 | 739 | 1,716 |
| NHTOM | 839 | 774 | 1,613 |
| IAC | 699 | 656 | 1,355 |
| BA | 679 | 467 | 1,146 |
| NHIAC | 560 | 520 | 1,080 |
| NHBA | 626 | 428 | 1,054 |
| IA | 396 | 383 | 779 |
| NHIA | 313 | 286 | 599 |
| HIAC | 139 | 136 | 275 |
| HIA | 83 | 97 | 180 |
| HTOM | 106 | 71 | 177 |
| HBAC | 95 | 60 | 155 |
| NAC | 81 | 66 | 147 |
| NHNAC | 60 | 57 | 117 |
| HAAC | 62 | 37 | 99 |
| HBA | 53 | 39 | 92 |
| HAA | 42 | 23 | 65 |
| NA | 40 | 23 | 63 |
| NHNA | 25 | 15 | 40 |
| HNAC | 21 | 9 | 30 |
| HNA | 15 | 8 | 23 |
• Wood County population
33.2 mi,
204°
• Portage County
31.8 mi,
156°
• Waupaca County
48.5 mi,
126°
• Shawano County
49.7 mi,
98°
• Oneida County
57.6 mi,
10°
• Clark County
43.2 mi,
255°
• Lincoln County
30.4 mi,
1°
• Taylor County
42.4 mi,
300°
• Langlade County
42 mi,
53°
• Menominee County
53.6 mi,
83°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Crawford, Brown Wisconsin Notes
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