Ko Olina, HI has a population of 1,691 and is the 12,008th largest city in the United States. The population density is 1,567 per sq mi which is 1130% higher than the Hawaii average and 1630% higher than the national average. The median age in Ko Olina is 42 which is approximately 8% higher than the Hawaii average of 39. In Ko Olina, 70% of the population over 15 years of age are married, 86% speak English and 3% speak Spanish. 18% of Ko Olina residents were born in Hawaii, 67% were born out of state, 3% were born outside of the United States and 12% were foreign born.