This is a list of properties and districts on the Hawaiian island of Oʻahu that are listed on the National Register of Historic Places. Oahu is the only major island in Honolulu County. The location of the city of Honolulu, Oʻahu is the most populous island in the state. There are 171 properties and districts on the island, including 16 National Historic Landmarks. Five formerly listed sites were demolished and have been removed from the Register.