According to theU.S. Census Bureau, the county has a total area of 766 square miles (1,980 km2), of which 720 square miles (1,900 km2) is land and 46 square miles (120 km2) (6.0%) is water.[9]
As of the2020 census, the county had a population of 104,154.[16] The population density was 144.7 per square mile.[1] The median age was 41.4 years, with 21.2% of residents under the age of 18 and 19.2% of residents 65 years of age or older; for every 100 females there were 97.0 males and for every 100 females age 18 and over there were 95.6 males.[17]
63.7% of residents lived in urban areas, while 36.3% lived in rural areas.[18]
There were 42,824 households in the county, of which 26.8% had children under the age of 18 living in them. Of all households, 49.8% were married-couple households, 19.1% were households with a male householder and no spouse or partner present, and 23.2% were households with a female householder and no spouse or partner present. About 29.5% of all households were made up of individuals and 12.7% had someone living alone who was 65 years of age or older.[17]
There were 45,740 housing units at an average density of 63.6 per square mile, of which 6.4% were vacant. Among occupied housing units, 69.5% were owner-occupied and 30.5% were renter-occupied; the homeowner vacancy rate was 1.1% and the rental vacancy rate was 5.6%.[1][17]
As of thecensus[19] of 2000, there were 97,296 people, 36,931 households, and 25,482 families residing in the county. Thepopulation density was 135 people per square mile (52 people/km2). There were 39,271 housing units at an average density of 54 units per square mile (21 units/km2). The racial makeup of the county was 96.16%White, 0.90%Black orAfrican American, 0.38%Native American, 0.87%Asian, 0.03%Pacific Islander, 0.84% fromother races, and 0.82% from two or more races. 2.04% of the population wereHispanic orLatino of any race. 57.7% were ofGerman, 6.1%Irish and 5.3%American ancestry. 95.5% spokeEnglish, 2.1%Spanish and 1.3%German as their first language.
There were 36,931 households, out of which 32.80% had children under the age of 18 living with them, 57.70% weremarried couples living together, 7.80% had a female householder with no husband present, and 31.00% were non-families. 25.40% of all households were made up of individuals, and 10.80% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.04.
In the county, the population was spread out, with 25.20% under the age of 18, 9.40% from 18 to 24, 28.70% from 25 to 44, 22.40% from 45 to 64, and 14.30% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 95.30 males. For every 100 females age 18 and over, there were 92.20 males.
In 2017, there were 1,066 births, giving a general fertility rate of 57.7 births per 1000 women aged 15–44, the 20th lowest rate out of all 72 Wisconsin counties.[20] Additionally, there were 74 reported induced abortions performed on women of Fond du Lac County residence in 2017.[21]
Fond du Lac County is governed by a twenty-five-member Board of Supervisors and an elected County Executive, all of whom are elected in nonpartisan elections. The other countywide officials, including the Sheriff and District Attorney, run in partisan elections.
^Reported Induced Abortions in Wisconsin, Office of Health Informatics, Division of Public Health, Wisconsin Department of Health Services. Section: Trend Information, 2013-2017, Table 18, pages 17-18