Hawaii, of course, is a state. And there's 600,000 Pacific Islanders on the mainland, along with 3.4 million Puerto Ricans, 1.2 million Cubans, 0.8 million Dominicans, and 1.7 million from the West Indies. So there's actually a large number of Pacific Islanders and Caribbean Americans who, if citizens, can vote in the United States federal elections and do have representation.
But Puerto Rico, the US Virgin Islands, American Samoa, Guam, and the Northern Mariana Islands are all United States Territories, and they do not have voting representatives in Washington DC, nor can they participate in the electoral college. (Additional US Territories have populations ranging from none to a handful.)