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Oko (ɔ̀kɔ́), also known as Ogori-Magongo and Oko-Eni-Osayin, is a dialect cluster spoken in Nigeria. It appears to form a branch of the "Nupe–Oko–Idoma" (noi) group of Niger–Congo languages. Most Oko speakers also speak Yoruba as a second language. The language is spoken in and around the towns of Ogori and Magongo in southwestern Kogi State, close to the Ondo and Edo state borders.
Oko at Ethnologue (18th ed., 2015) (subscription required)
Müller, André, Viveka Velupillai, Søren Wichmann, Cecil H. Brown, Eric W. Holman, Sebastian Sauppe, Pamela Brown, Harald Hammarström, Oleg Belyaev, Johann-Mattis List, Dik Bakker, Dmitri Egorov, Matthias Urban, Robert Mailhammer, Matthew S. Dryer, Evgenia Korovina, David Beck, Helen Geyer, Pattie Epps, Anthony Grant, and Pilar Valenzuela. 2013. ASJP World Language Trees of Lexical Similarity: Version 4 (October 2013).
Blench, Roger (2019). An Atlas of Nigerian Languages (4th ed.). Cambridge: Kay Williamson Educational Foundation.
Atoyebi, Joseph Dele (2009). A Reference Grammar of Oko. Umuneke-Okpala, Nigeria: Leipzig University Press.