Wailuku 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 Īao 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, the Wailuku Civic Center Historic District, the site of the Chee Kung Tong Society Building, and the Bailey House, a 19th century former seminary and home that houses a history museum and the Maui Historical Society.There are two ancient temples near Wailuku, called heiau — the Halekii Heiau and the Pihanakalani Heiau. Both date back hundreds of years, and were used for religious purposes by the native Hawaiians.Wailuku is served by Kahului Airport.