Marwari

No — Marwari is a distinct Indo-Aryan language belonging to the Rajasthani group, not Standard Hindi (which is Western Hindi / Khari Boli). The two share grammatical structure and many cognates, but Marwari has different verb conjugations, distinct pronouns, and its own vocabulary. Indian census categorizes Marwari under Hindi for political-administrative reasons, but linguists treat it as a separate language.

Across the Marwar region of western Rajasthan — Jodhpur, Bikaner, Jaisalmer, Pali, Nagaur, Barmer, and surrounding districts. Marwari-speaking trade communities have spread the language to major Indian cities and to overseas merchant diaspora populations across Africa, Southeast Asia, the United Kingdom, and North America. The Marwari business diaspora is one of the most economically influential in India.

Not federally — Marwari falls under Hindi in the Indian census. Campaigns for inclusion of Rajasthani (the broader cluster including Marwari, Mewari, and others) among the 22 scheduled languages have been ongoing for decades but haven't yet succeeded. Some Marwari literary and cultural institutions actively work to maintain a distinct identity for the language.

Devanagari is the dominant modern script. Historically, Marwari was also written in Mahajani — a Brahmic merchant script used by Marwari trading communities — and Modi, an older Indian commercial script. Both Mahajani and Modi are now archaic for general use, with most Marwari publishing in Devanagari.

Marwari is the largest member of the Rajasthani language group, which also includes Mewari (around Udaipur), Dhundhari (around Jaipur), Harauti (around Kota), Wagdi (Banswara region), and several smaller varieties. The Rajasthani languages are related and share grammatical structure but are not fully mutually intelligible across the group. Marwari is geographically western Rajasthani.