Kahuku, HI has a population of 2,486 and is the 9,893rd largest city in the United States. The population density is 2,581 per sq mi which is 1926% higher than the Hawaii average and 2749% higher than the national average. The median age in Kahuku is 34 which is approximately 12% lower than the Hawaii average of 39. In Kahuku, 63% of the population over 15 years of age are married, 64% speak English and 0% speak Spanish. 64% of Kahuku residents were born in Hawaii, 10% were born out of state, 5% were born outside of the United States and 21% were foreign born.