According to theUnited States Census Bureau, the town has a total area of 9.0 square miles (23.4 km2), all of it land.[3]
The town is located in a group of small hills. Both the Altamont andMonta Vista Faults pass through the town.
Los Altos Hills maintains a rural feel,[5] similar to the neighboringWoodside andPortola Valley. There are many open space preserves, such asRancho San Antonio and Westwind Barn.
The town's zoning regulations require a minimum lot size of one acre (4,000 m²), setbacks from the property boundary, andeasements for public pathways.[8][9] Landowners are limited to one primary dwelling per lot, which effectively bans multifamily housing; this ban and the minimum lot size were upheld as constitutional by theU.S. Court of Appeals for the Ninth Circuit in 1974.[10]
The town contracts with Santa Clara County for police and fire services, making it acontract city under California law.
The census reported that 99.2% of the population lived in households, 0.8% lived in non-institutionalized group quarters, and no one was institutionalized.[12]
There were 2,874 households, out of which 32.5% included children under the age of 18, 76.0% were married-couple households, 3.0% werecohabiting couple households, 12.4% had a female householder with no partner present, and 8.7% had a male householder with no partner present. 10.9% of households were one person, and 7.2% were one person aged 65 or older. The average household size was 2.93.[12] There were 2,450families (85.2% of all households).[13]
The age distribution was 19.2% under the age of 18, 7.9% aged 18 to 24, 13.7% aged 25 to 44, 31.5% aged 45 to 64, and 27.6% who were 65years of age or older. The median age was 51.7years. For every 100 females, there were 96.0 males.[12]
There were 3,098 housing units at an average density of 343.1 units per square mile (132.5 units/km2), of which 2,874 (92.8%) were occupied. Of these, 89.7% were owner-occupied, and 10.3% were occupied by renters.[12]
In 2023, the US Census Bureau estimated that 35.7% of the population were foreign-born. Of all people aged 5 or older, 61.5% spoke only English at home, 2.9% spokeSpanish, 10.0% spoke otherIndo-European languages, 21.8% spoke Asian or Pacific Islander languages, and 3.8% spoke other languages. Of those aged 25 or older, 99.2% were high school graduates and 85.6% had a bachelor's degree.[14]
The median household income in 2023 was more than $250,000, and theper capita income was $173,837. About 2.1% of families and 4.5% of the population were below the poverty line.[15]
At the2010 census Los Altos Hills had a population of 7,922. The population density was 900.0 inhabitants per square mile (347.5/km2). The racial makeup of Los Altos Hills was 5,417 (68.4%) White, 37 (0.5%) African American, 4 (0.1%) Native American, 2,109 (26.6%) Asian, 8 (0.1%) Pacific Islander, 50 (0.6%) from other races, and 297 (3.7%) from two or more races. Hispanic or Latino of any race were 213 people (2.7%).[16]
The census reported that 99.3% of the population lived in households and 0.7% lived in non-institutionalized group quarters.
There were 2,829 households, 949 (33.5%) had children under the age of 18 living in them, 2,204 (77.9%) wereopposite-sex married couples living together, 114 (4.0%) had a female householder with no husband present, 53 (1.9%) had a male householder with no wife present. There were 53 (1.9%)unmarried opposite-sex partnerships, and 19 (0.7%)same-sex married couples or partnerships. 359 households (12.7%) were one person and 210 (7.4%) had someone living alone who was 65 or older. The average household size was 2.78. There were 2,371 families (83.8% of households); the average family size was 3.02.
The age distribution was 1,811 people (22.9%) under the age of 18, 342 people (4.3%) aged 18 to 24, 1,083 people (13.7%) aged 25 to 44, 2,848 people (36.0%) aged 45 to 64, and 1,838 people (23.2%) who were 65 or older. The median age was 50.2 years. For every 100 females, there were 97.8 males. For every 100 females age 18 and over, there were 96.4 males.
There were 3,001 housing units at an average density of 341.0 per square mile, of the occupied units 2,582 (91.3%) were owner-occupied and 247 (8.7%) were rented. The homeowner vacancy rate was 1.2%; the rental vacancy rate was 4.2%. 7,162 people (90.4% of the population) lived in owner-occupied housing units and 707 people (8.9%) lived in rental housing units.
The median household income was $219,485 and the median family income was $224,922. Males had a median income of $152,361 versus $89,216 for females. The per capita income for the town was $118,779. About 2.2% of families and 2.6% of the population were below the poverty line, including 0.7% of those under age 18 and 3.8% of those age 65 or over.
Los Altos Hills is served by both thePalo Alto Unified School District (serving the northern part of the town) and theLos Altos School District (serving the southern part of the town). In 2008 the Los Altos School District reopened Gardner Bullis School, a public elementary (K-6) grade school in Los Altos Hills.
Ventana School is a private pre-school and elementary school modeled around theReggio Emilia approach. Pinewood is a private coeducational K-12 school. ThePinewood School Upper Campus is also located in Los Altos Hills, serving students in grades 7–12.