Aiea, HI has a population of 9,594 and is the 4,059th largest city in the United States. The population density is 5,776 per sq mi which is 2526% higher than the Hawaii average and 6275% higher than the national average. The median age in Aiea is 42 which is approximately 9% higher than the Hawaii average of 39. In Aiea, 62% of the population over 15 years of age are married, 82% speak English and 0% speak Spanish. 71% of Aiea residents were born in Hawaii, 15% were born out of state, 2% were born outside of the United States and 12% were foreign born.