Kihei, HI has a population of 21,964 and is the 1,982nd largest city in the United States. The population density is 2,346 per sq mi which is 1742% higher than the Hawaii average and 2489% higher than the national average. The median age in Kihei is 38 which is approximately equal to the Hawaii average of 39. In Kihei, 55% of the population over 15 years of age are married, 79% speak English and 8% speak Spanish. 37% of Kihei residents were born in Hawaii, 43% were born out of state, 2% were born outside of the United States and 19% were foreign born.