Mather, CA has a population of 4,435 and is the 6,983rd largest city in the United States. The population density is 442 per sq mi which is 90% higher than the California average and 388% higher than the national average. The median age in Mather is 35 which is approximately 2% lower than the California average of 36. In Mather, 65% of the population over 15 years of age are married, 66% speak English and 8% speak Spanish. 62% of Mather residents were born in California, 16% were born out of state, 2% were born outside of the United States and 20% were foreign born.