Aptos, CA has a population of 5,842 and is the 5,850th largest city in the United States. The population density is 908 per sq mi which is 291% higher than the California average and 903% higher than the national average. The median age in Aptos is 45 which is approximately 24% higher than the California average of 36. In Aptos, 57% of the population over 15 years of age are married, 90% speak English and 5% speak Spanish. 65% of Aptos residents were born in California, 27% were born out of state, 4% were born outside of the United States and 4% were foreign born.