Kailua-Kona is an unincorporated community and, under the name Kailua, a census-designated place (CDP) in Hawaii County, Hawaii, United States. It is most commonly referred to simply as Kona, but also as Kona Town, and occasionally as Kailua, thus its less frequent use. Kailua-Kona is the second-largest settlement on the island of Hawaii 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 Kaiminani. The population was 19,713 at the 2020 census, up from 11,975 at the 2010 census.