Sadri belongs to the Bihari language group, widely spoken in various provinces of East India. These include Assam, Bihar, Orissa. Few speakers can also be found in the nook of provinces of other states like Madhya Pradesh, West Bengal, Maharashtra, Andaman Islands, Nagaland. In the year 1994, IMA surveyed that there are 1,861,965 numbers of Sadri speakers in the whole of Indian subcontinent.
A particular tribe of India, namely Chero tribe uses Sadri as first language. Quite a handful speakers identity Sadri in their alternate names including Sadani, Sadana, Sadati, Sadari, Sadhan, Sadna, Sadrik, Santri, Siddri, Sradri, Sadhari, Sadan, Nagpuria, Nagpuri, Chota Nagpuri, Dikku Kaji, Gawari, Ganwari, Goari, Gauuari, Jharkhandhi. For writing , Sadri uses Devanagari script .