Hawaii is made up of 137 islands, but only 7 of the 8 largest islands are inhabited. The 7 major Hawaiian islands are Oahu, Maui, Hawaii (Big Island), Kauai, Molokai, Lanai, and Niihau. Kahaoolawe is the 8th largest Hawaiian island, but it’s against the law to visit unless you’re there for a valid volunteer work opportunity.