Meanings
proper noun
- One of 99 counties in Iowa, United States. County seat: Primghar.
Origin
Named after William Smith O'Brien.
Full word history & related roots →Cite this entry
APA
O'Brien County. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/O'Brien%20County
MLA
“O'Brien County.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/O'Brien%20County. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “O'Brien County,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/O'Brien%20County.
Source: O'Brien County on Wiktionary, CC BY-SA 4.0.