Meanings
proper noun
- One of 36 counties in Oregon, United States. County seat: Pendleton.
Origin
Named after the Umatilla River.
Full word history & related roots →Cite this entry
APA
Umatilla County. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Umatilla%20County
MLA
“Umatilla County.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Umatilla%20County. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “Umatilla County,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Umatilla%20County.
Source: Umatilla County on Wiktionary, CC BY-SA 4.0.