Waimanalo, HI has a population of 6,296 and is the 5,580th largest city in the United States. The population density is 1,446 per sq mi which is 1035% higher than the Hawaii average and 1496% higher than the national average. The median age in Waimanalo is 34 which is approximately 11% lower than the Hawaii average of 39. In Waimanalo, 52% of the population over 15 years of age are married, 83% speak English and 1% speak Spanish. 82% of Waimanalo residents were born in Hawaii, 8% were born out of state, 1% were born outside of the United States and 9% were foreign born.