The geographical extension of the language group is at its largest extent a territory of approximately 60,000 square miles (160,000 km2) in size, in Burma, India and Bangladesh. However exact geographical, and linguistic, extension is debated, such as by the Zomi National Congress claiming Thado language as part of Zomi language in the argument for a Zomi identity and a Zo homestate, "Zogam".
^The discovery of Zoland - Page 12 T. Gougin - 1980 "The word ' ZOMl ' comes from the word 'ZO' which means hill in the Zomi dialect or the Zomi language. The word MI means man in the Zomi language. Hence the word Zomi means highlanders (hillmen). The word ZOMI is never a foreign tongue or word. It is not a corrupt word composed for the nomenclature of people who are ethnically one and the same people having the same customs and usages. The word Zomi is the first and the last that ......"
^Bareh, Hamlet (2001). "Zou". Encyclopaedia of North-East India: Manipu. Mittal. pp. 260ff. ISBN978-81-7099-790-0. Retrieved 22 November 2010.
^People of India: Manipur - Page 253 Kumar Suresh Singh, M. Horam, S. H. M. Rizvi - 1998 "For example, a word for 'good' is hoih in Paite while it changes into hoi in the Zou language. Sannemla (Zou folksongs) are also popular among the Paite, although they are rendered in their individual dialect bearing the characteristic phonetic .."
^Encyclopaedia of South-Asian tribes - Volume 8 - Page 3436 Satinder Kumar - 2000 "According to the 1981 census, 12,515 persons speak the Zou language"
^Socio-political framework in North-East India - Page 150 Ramamoorthy Gopalakrishnan - 1996 "But against the background of all such conflict the Zomi National Congress went a step further in its argument for a Zomi identity by claiming Thado language as Zomi language. In the Kuki-Chin group of tribes, numerical strength has played ..."
^Evaluating the impact of family devotions upon selected families ... - Page 7 Nang Khen Khup, Oral Roberts University - 2007 "The Zomi language is descended from the Tibeto-Burman language domain. Though each tribal group speaks its own dialect, Burmese is widely used in Zoland (Chinland) due to Burmanization of military regime for over five decades"