Honolulu County (Hawaiian: Kalana ʻo Honolulu), officially known as the City and County of Honolulu and formerly as Oʻahu County, is a consolidated city-county in the U.S. state of Hawaii, one of five counties in the state. The city-county includes both Urban Honolulu (the state's capital and largest community) and the rest of the neighborhoods on the island of Oʻahu, as well as several minor outlying islands, including all of the Northwestern Hawaiian Islands (islands beyond Niʻihau) except Midway Atoll.
The consolidated city-county was established in the city charter adopted in 1907 and accepted by the Legislature of the Territory of Hawaii. As a municipal corporation and jurisdiction it manages aspects of government traditionally exercised by both municipalities and counties in the rest of the United States.
