Racial and ethnic composition 2020 census As of the
2020 census, the county had a population of 40,611. The median age was 45.3 years. 21.4% of residents were under the age of 18 and 22.0% of residents were 65 years of age or older. For every 100 females there were 100.3 males, and for every 100 females age 18 and over there were 98.7 males age 18 and over. The racial makeup of the county was 93.3%
White, 0.4%
Black or African American, 0.3%
American Indian and Alaska Native, 0.2%
Asian, <0.1%
Native Hawaiian and
Pacific Islander, 1.1% from some other race, and 4.6% from
two or more races.
Hispanic or Latino residents of any race comprised 4.1% of the population. 6.4% of residents lived in urban areas, while 93.6% lived in rural areas. There were 16,781 households in the county, of which 25.5% had children under the age of 18 living in them. Of all households, 49.8% were married-couple households, 19.4% were households with a male householder and no spouse or partner present, and 23.6% were households with a female householder and no spouse or partner present. About 29.9% of all households were made up of individuals and 14.4% had someone living alone who was 65 years of age or older. indicates Sanilac County had a 2010 population of 43,114. This decrease of -1,433 people from the
2000 United States census represents a 3.2% population loss in the decade. In 2010 there were 17,132 households and 11,885 families in the county. The
population density was . There were 22,725 housing units at an average density of . 96.6% of the population were
White, 0.5%
Native American, 0.3%
Black or African American, 0.3%
Asian, 1.1% of some other race and 1.2%
of two or more races. 3.3% were
Hispanic or Latino (of any race). 26.1% were of
German, 11.0%
Polish, 10.4%
English, 8.3%
Irish, 7.2%
American and 5.1%
French,
French Canadian or
Cajun ancestry. There were 17,132 households, out of which 29.2% had children under the age of 18 living with them, 55.3% were
husband and wife families, 9.8% had a female householder with no husband present, 30.6% were non-families, and 26.4% were made up of individuals. The average household size was 2.48 and the average family size was 2.97. In the county, the population was spread out, with 23.6% under age of 18, 7.4% from 18 to 24, 21.8% from 25 to 44, 29.6% from 45 to 64, and 17.6% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 97.8 males. For every 100 females age 18 and over, there were 96.7 males. The
2010 American Community Survey 3-year estimate ==Government==