Arcadia, CA has a population of 57,755 and is the 689th largest city in the United States. The population density is 5,286 per sq mi which is 2175% higher than the California average and 5735% higher than the national average. The median age in Arcadia is 44 which is approximately 22% higher than the California average of 36. In Arcadia, 64% of the population over 15 years of age are married, 38% speak English and 7% speak Spanish. 41% of Arcadia residents were born in California, 10% were born out of state, 1% were born outside of the United States and 48% were foreign born.