The 2020 United States census reported that Rolling Hills had a population of 793. The population density was 1,319.5 inhabitants per square mile (509.5/km2). The racial makeup of Rolling Hills was 583 (73.5%) White, 11 (1.4%) African American, 5 (0.6%) Native American, 17 (2.1%) Asian, 2 (0.3%) Pacific Islander, 67 (8.4%) from other races, and 108 (13.6%) from two or more races. Hispanic or Latino of any race were 185 persons (23.3%).[5]
The census reported that 792 people (99.9% of the population) lived in households and 1 (0.1%) was institutionalized.[5]
There were 296 households, out of which 91 (30.7%) had children under the age of 18 living in them, 205 (69.3%) were married-couple households, 14 (4.7%) were cohabiting couple households, 46 (15.5%) had a female householder with no partner present, and 31 (10.5%) had a male householder with no partner present. 40 households (13.5%) were one person, and 29 (9.8%) were one person aged 65 or older. The average household size was 2.68.[5] There were 244 families (82.4% of all households).[6]
The age distribution was 141 people (17.8%) under the age of 18, 58 people (7.3%) aged 18 to 24, 177 people (22.3%) aged 25 to 44, 175 people (22.1%) aged 45 to 64, and 242 people (30.5%) who were 65 years of age or older. The median age was 46.8 years. For every 100 females, there were 98.7 males.[5]
There were 301 housing units at an average density of 500.8 units per square mile (193.4 units/km2), of which 296 (98.3%) were occupied. Of these, 276 (93.2%) were owner-occupied, and 20 (6.8%) were occupied by renters.[5]