Oahu

Oʻahu, sometimes written Oahu, is the third-largest and most populated island of the Hawaiian Islands and of the U.S. state of Hawaii. The state capital, Honolulu, is on Oʻahu's southeastern coast. The island of Oʻahu and the uninhabited Northwestern Hawaiian Islands constitute the City and County of Honolulu. In 2025, Oʻahu had a population of 988,703, a decline of 27,791 (2.7%) from 1,016,494 in 2020 (approximately 70% of the total 1,455,271 population of the Hawaiian Islands, with approximately 81% of those living in or near the Honolulu urban area). Oʻahu is 44 miles (71 km) long from east to west and roughly 30 mi (48 km) across its longest north-south distance. Its shoreline is 227 mi (365 km) long. Including small associated islands such as Ford Island, plus those in Kāneʻohe Bay and off the eastern (windward) coast, the area of Oʻahu is 596.7 square miles (1,545.4 km2), making it the 20th-largest island in the United States. Well-known features of Oʻahu include Waikīkī, Pearl Harbor, Diamond Head, Hanauma Bay, Kāneʻohe Bay, Kailua Bay, and the North Shore.

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