2020 census

The 2020 United States census counted 247 people, 103 households, and 71 families in Hillsdale.^[7][8] The population density was 161.9 per square mile (62.5/km²). There were 115 housing units at an average density of 75.4 per square mile (29.1/km²).^[8][9] The racial makeup was 88.66% (219) white or European American (88.66% non-Hispanic white), 0.4% (1) black or African-American, 0.4% (1) Native American or Alaska Native, 0.0% (0) Asian, 0.0% (0) Pacific Islander or Native Hawaiian, 0.81% (2) from other races, and 9.72% (24) from two or more races.^[10] Hispanic or Latino of any race was 4.05% (10) of the population.^[11]

Of the 103 households, 25.2% had children under the age of 18; 58.3% were married couples living together; 27.2% had a female householder with no spouse or partner present. 30.1% of households consisted of individuals and 11.7% had someone living alone who was 65 years of age or older.^[8] The average household size was 2.7 and the average family size was 3.0.^[12] The percent of those with a bachelor’s degree or higher was estimated to be 35.6% of the population.^[13]

17.8% of the population was under the age of 18, 7.7% from 18 to 24, 19.8% from 25 to 44, 27.9% from 45 to 64, and 26.7% who were 65 years of age or older. The median age was 48.7 years. For every 100 females, there were 97.6 males.^[8] For every 100 females ages 18 and older, there were 93.3 males.^[8]

The 2016-2020 5-year American Community Survey estimates show that the median household income was $63,676 (with a margin of error of +/- $18,306) and the median family income was $64,632 (+/- $43,398).^[14] Males had a median income of $32,201 (+/- $23,110). The median income for those above 16 years old was $31,957 (+/- $7,155).^[15] Approximately, 0.0% of families and 5.3% of the population were below the poverty line, including 0.0% of those under the age of 18 and 0.0% of those ages 65 or over.^[16][17]