Hindi is the main language used in the northern Indian states of Rajasthan, Delhi, Haryana, Uttarakhand, Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Himachal Pradesh, Jharkhand and Bihar. Rajasthan, Uttar Pradesh and Uttarakhand states. Government of India official language of Bihar, Chhattisgarh,ĭelhi, Haryana, Himachal Pradesh, Jharkhand, Madhya Pradesh, Status: Official language of the Federal.