The Umatilla lived in the Umatilla River and adjacent parts of the Columbia River drainages in northeastern Oregon. They now live on the Umatilla Indian Reservation in the same area with the Wallawalla Cayuse. They spoke a Sahaptin language of the Penutian phylum and numbered about one thousand in the 1980s.
Kennedy, James Bradford (1977). "The Umatilla Indian Reservation, 1855-1975: Factors Contributing to a Diminished Land Resource Base." Dissertation Abstracts International 38(4):2344A.
Stern, Theodore (1960). "A Umatilla Prophet Cult." Acts of the International Congress of Anthropological and Ethnological Sciences 5:346-350.
"Umatilla." Encyclopedia of World Cultures. . Encyclopedia.com. (February 24, 2018). http://www.encyclopedia.com/humanities/encyclopedias-almanacs-transcripts-and-maps/umatilla
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Umatilla (ŭm´ətĬl´ə), river, c.85 mi (140 km) long, rising in NE Oreg. in the Blue Mts. It flows W past Pendleton, then NW to the Columbia River at the city of Umatilla (1990 pop. 3,046). The Umatilla project taps two of the river's tributaries for irrigation.
"Umatilla." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 24, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/umatilla
"Umatilla." The Columbia Encyclopedia, 6th ed.. . Retrieved February 24, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/umatilla