Aptos Hills-Larkin Valley first appeared as a
census-designated place in the
1990 United States census. The median age was 51.4 years. About 14.7% of residents were under the age of 18 and 26.9% were 65 years of age or older. For every 100 females, there were 94.8 males, and for every 100 females age 18 and over, there were 93.9 males age 18 and over. The census reported that 99.5% of the population lived in households, 0.5% lived in non-institutionalized group quarters, and no one was institutionalized. There were 903 households, out of which 24.0% included children under the age of 18. Of all households, 54.2% were married-couple households, 6.9% were
cohabiting couple households, 14.5% had a male householder with no spouse or partner present, and 24.5% had a female householder with no spouse or partner present. About 20.3% of all households were made up of individuals and 12.9% had someone living alone who was 65 years of age or older. The average household size was 2.63. There were 635
families (70.3% of all households). ==Government==