About Hindi | Department of Linguistics | Illinois
https://linguistics.illinois.edu/languages/hindi/about-hindi
Hindi, along with English, are the official languages of India. Hindi is also the official language of Bihar, Delhi, Haryana, Jharkhand, Madhya Pradesh, Rajasthan, Uttarakhand and Uttar Pradesh. In Chhattisgarh, one of the dialects of Hindi, namely Chhattisgarhi, has recently been made the official language of the state.
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