Waipio, HI has a population of 11,554 and is the 3,523rd largest city in the United States. The population density is 9,231 per sq mi which is 7147% higher than the Hawaii average and 10088% higher than the national average. The median age in Waipio is 36 which is approximately 6% lower than the Hawaii average of 39. In Waipio, 58% of the population over 15 years of age are married, 78% speak English and 2% speak Spanish. 66% of Waipio residents were born in Hawaii, 13% were born out of state, 4% were born outside of the United States and 17% were foreign born.