The United States Census Bureau defines Kauaʻi as Census Tracts 401 through 409 of Kauaʻi County, Hawaiʻi, which is all of the county except for the islands of Kaʻula, Lehua, and Niʻihau. The 2010 census population of Kauaʻi was 67,091,with the largest town by population being Kapaʻa.
[wiki]
