Hanamāʻulu is a census-designated place (CDP) in Kauaʻi County, Hawaiʻi, United States. It is the ancient birthplace of Kawelo, a member of Kauai's ruling family. The population was 4,994 at the 2020 census, up from 3,272 at the 2000 census.

Kauaʻi County, officially known as the County of Kauaʻi, is a county in the U.S. state of Hawaiʻi. It encompasses the islands of Kauaʻi, Niʻihau, Lehua, and Kaʻula. According to the 2020 Census, the population was 73,298. The county seat is Līhuʻe.