Assamese Radios app. Assamese is the easternmost Indo-Aryan language. It is used mainly in the state of Assam in North-East India. It is the official language of Assam. It is also spoken in parts of Arunachal Pradesh and other northeast Indian states. Nagamese, an Assamese-based Creole language is widely used in Nagaland and parts of Assam. Small pockets of Assamese speakers can be found in Bhutan. The easternmost of Indo-European languages, it is spoken by over 20 million people and has 16.8 million native speakers.