Are the people in Saipan a US Citizens?

Yes, the people of Saipan are U.S. citizens. Saipan is part of the Northern Mariana Islands, which is a U.S. territory. Residents of the Northern Mariana Islands are U.S. citizens by birth, following the covenant between the Northern Mariana Islands and the United States established in 1976. However, they do not have voting representation in the U.S. Congress.