Gundumar Tinian tana ɗaya daga cikin gundumomi huɗu na tsibirin Mariana ta Arewa. Ya ƙunshi tsibiran Tinian da Aguiguan da tsibiran da ke bakin teku. Gundumar ita ce ta biyu ta kudu a cikin Arewacin Marianas kuma tana da yanki na 108.1 km2.Ƙididdiga na 2000 ya kasance mutane 3,540,dukansu suna zaune a tsibirin Tinian (Aguijan ba kowa ba ne). Wurin zama na birni da babban ƙauyen tsibirin Tinian shine San Jose,wanda ke bakin tekun kudu maso yamma.

Tinian Municipality
municipality of the Northern Mariana Islands (en) Fassara
Bayanai
Nahiya Osheniya
Ƙasa Tarayyar Amurka
Wuri
Map
 15°01′44″N 145°36′58″E / 15.029°N 145.616°E / 15.029; 145.616
Insular area of the United States (en) FassaraNorthern Mariana Islands (en) Fassara
Taswirar kananan hukumomi hudu na CNMI, tare da Tinian Municipality da aka haskaka da ja.