Kauaʻi County is a county in the U.S. state of Hawaiʻi. It consists of the islands of Kauaʻi, Niʻihau, Lehua, and Kaʻula. As of the 2020 Census the population was 73,298. The county seat is Līhuʻe. The Kapa'a Micropolitan Statistical Area includes all of Kauai County.