Mayfair, CA has a population of 4,605 and is the 6,830th largest city in the United States. The population density is 8,883 per sq mi which is 3722% higher than the California average and 9705% higher than the national average. The median age in Mayfair is 29 which is approximately 19% lower than the California average of 36. In Mayfair, 41% of the population over 15 years of age are married, 45% speak English and 47% speak Spanish. 69% of Mayfair residents were born in California, 6% were born out of state, 0% were born outside of the United States and 25% were foreign born.