Kailua-Kona is an unincorporated community and census-designated place (CDP) in Hawaii County, Hawaii, United States. It is also known as Kailua (a name it shares with a community on the windward side of Oahu), as Kona (a name it shares with the district to which it belongs) and as Kona Town. Kailua-Kona is the second-largest settlement on the island of Hawaii (after Hilo) and the largest on the island's west side, where it is the center of commerce and the tourist industry. Kailua-Kona is served by Kona International Airport, just to the north in the adjacent CDP of Kalaoa. The population was 19,713 at the 2020 census, up from 11,975 at the 2010 census.