Waimanalo Beach, HI has a population of 4,227 and is the 7,187th largest city in the United States. The population density is 2,147 per sq mi which is 1586% higher than the Hawaii average and 2270% higher than the national average. The median age in Waimanalo Beach is 39 which is approximately 2% higher than the Hawaii average of 39. In Waimanalo Beach, 52% of the population over 15 years of age are married, 88% speak English and 1% speak Spanish. 85% of Waimanalo Beach residents were born in Hawaii, 11% were born out of state, 1% were born outside of the United States and 3% were foreign born.