Santa Maria, CA has a population of 103,642 and is the 295th largest city in the United States. The population density is 4,549 per sq mi which is 1858% higher than the California average and 4921% higher than the national average. The median age in Santa Maria is 29 which is approximately 18% lower than the California average of 36. In Santa Maria, 53% of the population over 15 years of age are married, 35% speak English and 59% speak Spanish. 55% of Santa Maria residents were born in California, 10% were born out of state, 1% were born outside of the United States and 35% were foreign born.