SIUSLAW SAIUSLA : Click for ALSEA or COOS   Siuslaw Territory: Coastal Oregon. Siuslaw Divisions: Siuslaw and Lower Umpqua / Kuitsh / Kalawats.   Portals .   Confederated Tribes of The Coos, Lower Umpqua, and Siuslaw Indians Coos, Oregon   Confederated Tribes of Siletz : part of whose membership is Siuslaw and Lower Umpqua Siletz, Oregon Siuslaw Population United States (2010) - 450   C O O S I A N