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is a census-designated place (CDP) in Maui County, Hawaii, United States. The population was 12,296 at the 2000 census. It is the county seat of Maui County.
Wailuku is located just west of Kahului, at the mouth of the Iao Valley. In the early 20th century Wailuku was the main tourist destination on Maui, though it has since been eclipsed with the rise of the resort towns such as Kaanapali, so much that there are no hotels to speak of in Wailuku.
Historic sites in the town include Kaahumanu Church (named after one of Hawaii's great monarchs, Queen Kaahumanu) which dates to 1876, and the Bailey House, also a 19th century relic that is home to a history museum.
— the Halekii Heiau and the Pihanakalani Heiau. Both date back hundreds of years, and were used for religious purposes by the native Hawaiians.
The town is situated at 249 feet at the base of West Maui Volcano, known historically as Mauna Kahalawai and Hale Mahina, on the northern edge of the isthmus of East Maui (Haleakala) and West Maui.
According to the United States Census Bureau, the CDP has a total area of , of which, of it is land and of it (6.8%) is water.