Yoruba is predominantly spoken in the southwestern region of Nigeria. The states where Yoruba is most commonly used include Lagos, Oyo, Ogun, Osun, Ondo, and Ekiti. Additionally, there are significant Yoruba-speaking populations in parts of Kwara and Kogi states. Yoruba is not only a major language in Nigeria but also has speakers in neighboring countries like Benin and Togo.

If you need more specific information about the cultural or social aspects of the Yoruba language, feel free to ask!