Marwari (Mārwāṛī मारवाड़ी; also rendered Marvari, Marwadi, Marvadi), is spoken in the Indian state of Rajasthan. Marwari is also found in the neighboring state of Gujarat and Haryana and in Eastern Pakistan. With some 13.2 million speakers (as of 1997, ca.), it is the largest language by number of speakers of the Marwari subgroup of the Rajasthani language. There are 13 million speakers in Rajasthan and rest 200,000 in Eastern Pakistan. There about 23 dialects of the Marwari Language.
It is popularly written in Devanagari script, as is Hindi, Sanskrit and Nepali. Marwari currently has no official status as a language of education and government. There has been a push in the recent past for the national government to recognize this language and give it a scheduled status. The state of Rajasthan recognizes Rajasthani as a language.
In Pakistan, there are two varieties of Marwari. They may or may not be close enough to Indian Marwari to be considered the same language. Marwari speakers are concentrated in Sindh.
The Marwari language was used in the recent Indian movie, Paheli, where it was mixed with Hindi so it is understandable to the main stream (Hindi speakers) audience. Marwari is still spoken widely in and around Jodhpur. There are ongoing efforts to identify and classify this language cluster and the language differences. (Wikipedia)