Chhattisgarhi is not a dialect of standard Hindi. It belongs to the Eastern Hindi group, with Awadhi and Bagheli, while standard Hindi descends from Western Hindi — so it is a cousin of the standard, not a deviation from it. It carries the Eastern Hindi third-person past in -is, so a verb behaves as it does in Awadhi and Bhojpuri rather than as it does in Delhi. Around 16.2 million people returned it in the 2011 Census, and it was made an official language of the state alongside Hindi in 2007. Its written literature is recent and datable: Pandit Sundarlal Sharma's Chhattisgarhi Danleela of 1898 is conventionally taken as the first modern literary work in the language, which means everything before it — Pandwani, Chandaini, Bharthari, the whole Nacha repertoire — existed only as performance. The northern fringe is where it gets interesting: on the Sarguja rise, Sadri works as a lingua franca, Kurukh is Dravidian, and Korwa is Austroasiatic, so three language families meet within a couple of districts.
Khaltahi (central Chhattisgarhi)Indo-Aryan, Eastern Hindi
The Raipur, Durg and Bemetara register, treated as the standard because it is what broadcasting and publishing use.
बोलने वाले: Part of the roughly 16.2 million who returned Chhattisgarhi in 2011
BilaspuriIndo-Aryan, Eastern Hindi
The northern-plain variety around Bilaspur, Janjgir and Ratanpur; the register in which most Panthi and Bharthari repertoire is sung.
LariaIndo-Aryan, Eastern Hindi
The eastern variety towards Raigarh and the Mahanadi gorge, shading into Sambalpuri and Odia. Speakers here are routinely bilingual and the vocabulary moves in both directions.
SurgujiaIndo-Aryan, Eastern Hindi
The northern fringe variety, in contact with Sadri and with the Chota Nagpur languages, and noticeably different from the plain's speech in intonation.
SadriIndo-Aryan
Not a Chhattisgarhi variety but the trade and inter-community lingua franca of the Sarguja and Jashpur belt, shared with Jharkhand — the language people use when their first languages belong to different families.
KurukhDravidian, North Dravidian
Spoken by Oraon households in Jashpur and the northern districts. A second Dravidian island in central India, unrelated to Chhattisgarhi and related distantly to Gondi far to the west.
KorwaAustroasiatic, Munda
Spoken in pockets of the Sarguja and Jashpur hills, with relatives on the Chota Nagpur plateau. Its presence is why the northern fringe of a rice plain holds three language families at once.