Kauaʻi County is a county located in the U.S. state of Hawaiʻi. It consists of the islands of Kauaʻi, Niʻihau, Lehua, and Kaʻula, in the state of Hawaiʻi. As of the 2010 Census the population was 67,091. The county seat is Līhuʻe. The Kapa'a Micropolitan Statistical Area includes all of Kauai County.