Lanai City, HI has a population of 3,446 and is the 8,120th largest city in the United States. The population density is 509 per sq mi which is 300% higher than the Hawaii average and 462% higher than the national average. The median age in Lanai City is 41 which is approximately 6% higher than the Hawaii average of 39. In Lanai City, 63% of the population over 15 years of age are married, 73% speak English and 0% speak Spanish. 56% of Lanai City residents were born in Hawaii, 13% were born out of state, 1% were born outside of the United States and 30% were foreign born.