Necker Island is a small island in the Northwestern Hawaiian Islands. It is located at 23°34′30″N 164°42′01″W in the Pacific Ocean, 430 miles northwest of Honolulu, Hawaii, 155 miles northwest of Nihoa, and 8 miles north of the Tropic of Cancer. It is part of the state of Hawaii in the United States. It contains important prehistoric archaeological sites of the Hawaiian culture and is part of the Hawaiian Islands National Wildlife Refuge within the Papahānaumokuākea Marine National Monument.