Alto, California

Alto is a census-designated place adjacent to Mill Valley in Marin County, California. It lies at an elevation of 26 feet. The population was 732 at the 2020 census.

Geography

According to the United States Census Bureau, the CDP covered an area of, all of it land.

Alto first appeared as a census-designated place in the 2010 United States census.
The 2020 United States census reported that Alto had a population of 732. The population density was. The racial makeup of Alto was 80.3% White, 0.3% African American, 0.3% Native American, 4.4% Asian, 0.1% Pacific Islander, 3.6% from other races, and 11.1% from two or more races. Hispanic or Latino of any race were 7.8% of the population.
The whole population lived in households.
There were 294 households, out of which 34.0% included children under the age of 18, 51.0% were married-couple households, 5.8% were cohabiting couple households, 27.9% had a female householder with no partner present, and 15.3% had a male householder with no partner present. 28.9% of households were one person, and 9.5% were one person aged 65 or older. The average household size was 2.49. There were 193 families.
The age distribution was 24.5% under the age of 18, 4.9% aged 18 to 24, 23.2% aged 25 to 44, 33.3% aged 45 to 64, and 14.1% who were 65years of age or older. The median age was 42.7years. For every 100 females, there were 98.4 males.
There were 314 housing units at an average density of, of which 294 were occupied. Of these, 52.7% were owner-occupied, and 47.3% were occupied by renters.