Los Altos, CA has a population of 30,238 and is the 1,411th largest city in the United States. The population density is 4,668 per sq mi which is 1909% higher than the California average and 5052% higher than the national average. The median age in Los Altos is 46 which is approximately 27% higher than the California average of 36. In Los Altos, 75% of the population over 15 years of age are married, 71% speak English and 3% speak Spanish. 44% of Los Altos residents were born in California, 29% were born out of state, 1% were born outside of the United States and 25% were foreign born.