Honolulu County (officially known as the City and County of Honolulu, formerly Oahu County) is a consolidated city–county located in the U.S. state of Hawaii. The City and County includes both the city of Honolulu (the state's capital and largest city) and the rest of the island of , as well as several minor outlying islands, including all of the Northwestern Hawaiian Islands (islands beyond Niihau) except Midway Atoll.
The consolidated city-county was established in the city charter adopted in 1907 and accepted by the Legislature of the . 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.
The population of Honolulu County at the 2010 Census was 953,207, making it the tenth-largest municipality in the United States. Because of Hawaii's municipal structure, the United States Census Bureau divides Honolulu County into several census-designated places for statistical purposes.
The current mayor of Honolulu County is Kirk Caldwell, who reclaimed the job from the person who defeated him in a 2010 special election, Peter Carlisle, in 2013. The county motto is Haaheo No O Honolulu (Honolulu Pride).