Kilauea, HI has a population of 2,644 and is the 9,489th largest city in the United States. The population density is 532 per sq mi which is 318% higher than the Hawaii average and 487% higher than the national average. The median age in Kilauea is 42 which is approximately 10% higher than the Hawaii average of 39. In Kilauea, 55% of the population over 15 years of age are married, 79% speak English and 2% speak Spanish. 33% of Kilauea residents were born in Hawaii, 47% were born out of state, 3% were born outside of the United States and 17% were foreign born.