According to the Official Language Rules, Indian states and union territories are classified into three regions: A, B, and C. These regions are defined based on the usage of the official language Hindi.
Region A:
Includes states and union territories where Hindi is widely used and preferred for official purposes.
Region B:
Includes states and union territories where Hindi and English are both used for official purposes.
Region C:
Includes all other states and union territories where Hindi usage is not as prevalent.
Specific Examples:
Region A: Bihar, Chhattisgarh, Haryana, Himachal Pradesh, Jharkhand, Madhya Pradesh, Rajasthan, Uttar Pradesh, Delhi, and the Andaman and Nicobar Islands.
Region B: Gujarat, Maharashtra, Punjab, and the Union Territory of Chandigarh.
Region C: The states and union territories not included in Regions A and B