NUTACHI MISSOURIA Click for HO-CHUNK, IOWA, or OTOE   Missouria Territory: Missouri State. In 1781, the Missouria's numbers were severely reduced by a smallpox epidemic. Afterwards, attacks by other tribes almost finished them off.   Portals .   Otoe-Missouria Tribe Red Rock, Oklahoma Missouria Population United States (2010) - 175 S I O U X WINNEBAGO