Milpitas, CA has a population of 73,447 and is the 486th largest city in the United States. The population density is 5,408 per sq mi which is 2227% higher than the California average and 5869% higher than the national average. The median age in Milpitas is 37 which is approximately 2% higher than the California average of 36. In Milpitas, 59% of the population over 15 years of age are married, 32% speak English and 9% speak Spanish. 38% of Milpitas residents were born in California, 8% were born out of state, 2% were born outside of the United States and 53% were foreign born.