Westminster, CA has a population of 91,635 and is the 354th largest city in the United States. The population density is 9,125 per sq mi which is 3827% higher than the California average and 9972% higher than the national average. The median age in Westminster is 41 which is approximately 14% higher than the California average of 36. In Westminster, 56% of the population over 15 years of age are married, 35% speak English and 18% speak Spanish. 43% of Westminster residents were born in California, 11% were born out of state, 1% were born outside of the United States and 45% were foreign born.