Racial and ethnic composition 2020 census As of the
2020 census, the county had a population of 171,730 and a median age of 39.1 years. 20.7% of residents were under the age of 18 and 17.0% of residents were 65 years of age or older. For every 100 females there were 101.2 males, and for every 100 females age 18 and over there were 100.2 males age 18 and over. The population density was . There were 76,046 housing units at an average density of , of which 6.0% were vacant. There were 71,473 households in the county, of which 26.1% had children under the age of 18 living in them. Of all households, 45.3% were married-couple households, 20.7% were households with a male householder and no spouse or partner present, and 25.4% were households with a female householder and no spouse or partner present. About 31.8% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. Among occupied housing units, 64.7% were owner-occupied and 35.3% were renter-occupied, with a homeowner vacancy rate of 0.9% and a rental vacancy rate of 4.8%. The racial makeup of the county was 86.2%
White, 3.0%
Black or African American, 0.7%
American Indian and Alaska Native, 3.3%
Asian, <0.1%
Native Hawaiian and
Pacific Islander, 1.8% from some other race, and 5.1% from
two or more races.
Hispanic or Latino residents of any race comprised 4.8% of the population.
2000 census As of the
census of 2000, there were 156,763 people, 61,157 households, and 39,568 families residing in the county. The
population density was . There were 64,721 housing units at an average density of . The racial makeup of the county was 94.92%
White, 1.12%
Black or
African American, 0.46%
Native American, 1.84%
Asian, 0.02%
Pacific Islander, 0.72% from
other races, and 0.92% from two or more races. 1.96% of the population were
Hispanic or
Latino of any race. 52.4% were of
German, 6.2%
Irish and 5.7%
Polish ancestry. 94.6% spoke
English, 2.5%
Spanish and 1.0%
Hmong as their first language. There were 61,157 households, out of which 31.00% had children under the age of 18 living with them, 53.00% were
married couples living together, 8.30% had a female householder with no husband present, and 35.30% were non-families. 27.60% of all households were made up of individuals, and 9.90% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.99. By age, 23.80% of the population was under 18, 11.80% from 18 to 24, 30.40% from 25 to 44, 21.50% from 45 to 64, and 12.50% were 65 or older. The median age was 35 years. For every 100 females there were 99.40 males. For every 100 females age 18 and over, there were 97.80 males. In 2017, there were 1,833 births, giving a general fertility rate of 56.5 births per 1000 women aged 15–44, the 15th lowest rate out of all 72 Wisconsin counties. Additionally, there were 123 reported induced abortions performed on women of Winnebago County residence in 2017. ==Government==