Its inhabitants speak the Ijebu dialect of the Yoruba language. The Oba of Isonyin is addressed as the Saderiren of Isonyin. The immediate past Oba was Oba Funso Omo-Ogunkoya, who died in 2015. His predecessor, the first king of Isonyin, Oba Amos Kolawole Agbolade Ogunnuga, died in 2002.
Schools exist in Isonyin, such as the Emmanuel Primary School. It is a town known for its emphasis and strict commitment to education. In the past, its privately managed boarding schools attracted school children from all over the South West of Nigeria to attend the famous Emmanuel School Isonyin.
Some of the eminent sons of Isonyin include Emeritus Professor V. A. Oyenuga, who was the first black African to obtain Ph. D and D. Sc. degrees in Agricultural Sciences. Sophie Odunlami of the Faith Tabernacle era of praying groups that metamorphosed into the (Christ) Apostolic Church in Nigeria. Olori Matilda Alaba Adesanya, first wife of then Awujale of Ijebu Land, Oba Daniel Robertson Adesanya, and mother of Late Prince Justice L.E.V. Adesanya.
- Makinde, Bankole (22 May 2017). "Who's who in Nigeria". Newswatch. p. 1267 – via Google Books.
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