Kapaʻa, also spelled Kapaa, is an unincorporated community and census-designated place in Kauaʻi County, Hawaiʻi, United States. It is the most populous town in the island of Kauai, with a population of 11,652 as of the 2020 census, up from 9,471 at the 2000 census. Kapaʻa is a Hawaiian word meaning "the solid one". It is formed from ka and pa'a. Notable people from Kapaʻa include Lokalia Montgomery.