The United States Census Bureau defines Kauaʻi as census tracts 401 through 409 of Kauai County, Hawaiʻi, which comprises all of the county except for the islands of Kaʻula, Lehua and Niʻihau.
A Oficina Censal dos Estados Unidos define a Kauai como as seccións censais 401 a 409 do Condado de Kauai, Hawai, que é todo o condado salvo as illas de Kaula, Lehua, e Niihau.