Tinian is one of the three principal islands of the Commonwealth of the Northern Mariana Islands (CNMI). Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern Marianas. Tinian's largest village is San Jose. Tinian is just south of the most inhabited island Saipan, but north of the populated Rota to the south. The island is home to many WW2 historical sites, cattle ranches, and beaches. There was a 5-star casino that operated from 1998 to 2015; remaining are other hotels/resorts and a golf course. The main access to Saipan is by a short airplane ride from the international airport, or by a charter boat.

The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands, is an unincorporated territory and commonwealth of the United States consisting of 14 islands in the northwestern Pacific Ocean. The CNMI includes the 14 northernmost islands in the Mariana Archipelago; the southernmost island, Guam, is a separate U.S. territory. The Northern Mariana Islands were listed by the United Nations as a non-self governing territory until 1990.