Mililani Mauka, HI has a population of 20,322 and is the 2,140th largest city in the United States. The population density is 5,108 per sq mi which is 3910% higher than the Hawaii average and 5538% higher than the national average. The median age in Mililani Mauka is 37 which is approximately 4% lower than the Hawaii average of 39. In Mililani Mauka, 64% of the population over 15 years of age are married, 88% speak English and 1% speak Spanish. 66% of Mililani Mauka residents were born in Hawaii, 22% were born out of state, 3% were born outside of the United States and 9% were foreign born.