Bengali is the official language of West Bengal and is spoken by the majority of the population. It is also one of the most widely spoken languages in India.

Odia is the official language of Odisha and is spoken by the majority of the population. It is a member of the Indo-Aryan language family.

Santali is the most widely spoken language in Jharkhand, followed by Hindi. Santali is an Austroasiatic language spoken by the Santhal people.

Hindi is the official language of Bihar, although several other languages, such as Bhojpuri, Maithili, and Urdu, are also spoken in the state.

Assamese is the official language of Assam and is spoken by the majority of the population. It is a member of the Indo-Aryan language family.

Manipuri, also known as Meitei, is the official language of Manipur and is spoken by the majority of the population. It is a Tibeto-Burman language.

Kokborok is the official language of Tripura and is spoken by the majority of the population. It is a Tibeto-Burman language.

Mizo, also known as Lushai, is the official language of Mizoram and is spoken by the majority of the population. It is a Tibeto-Burman language.

Naga is a collective term for a group of languages spoken by various Naga tribes in Nagaland. These languages belong to the Tibeto-Burman language family.

Nishi is one of the major languages spoken in Arunachal Pradesh. It is a Tibeto-Burman language spoken by the Nishi people.

Nepali is the official language of Sikkim and is spoken by the majority of the population. It is also one of the official languages of India.

Nicobarese is a group of languages spoken by the indigenous people of the Nicobar Islands. These languages belong to the Austroasiatic language family.

Khasi is the most widely spoken language in Meghalaya. It is an Austroasiatic language spoken by the Khasi people.

Chhattisgarhi is the most widely spoken language in Chhattisgarh. It is an Indo-Aryan language closely related to Hindi.

Santali is the most widely spoken language in Jharkhand, followed by Hindi. Santali is an Austroasiatic language spoken by the Santhal people.