Where in the World is Saipan found? Saipan is the capital of Northern Mariana Islands (Commonwealth of the Northern Mariana Islands), situated in the Micronesia subregion of Oceania. In Saipan, the currency used is United States dollar ($), which is the official currency used in Northern Mariana Islands. The Latitude, Longitude cordinates of Saipan are 15.2123, 145.7545.