|4,800 (2000 census)|
There are over 4000 speakers of Tsum, known as Tsumpas. Many speakers of the language have migrated away from the Tsum valley, and now live in Kathmandu and abroad. Younger Tsumpas are more likely to be educated in Nepali and English, leading to attrition of the language.
Tsum has a two-tone language system.
Relationship to other languages
There is a varying degree of mutual intelligibility between Tsum and other Kyirong-Yolmo varieties. It is most closely related to Nubri and Gyalsumdo, and more distantly related to other languages in the family.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Tsum". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- N. Tournadre (2005) "L'aire linguistique tibétaine et ses divers dialectes." Lalies, 2005, n°25, p. 7–56 
- Mark Donohue and Dubi Nanda Dhakal (2016). A Tsum Lexicon. München: LINCOM. pp. ii. ISBN 9783862886821.
- Webster, Jeff (1992). A Socio-linguistic Survey of the Tibeto-Burman Dialects of North Gorkha District. ms, SIL.
- Gawne, Lauren (2013). "Report on the relationship between Yolmo and Kagate". Himalayan Linguistics. 12: 1–27.
- Dhakal, Dubi Nanda & Mark Donohue. 2015. Inchoative/causative verb pairs in Tsum. Nepalese Linguistics 30. 45-49.
- Donohue, Mark & Dubi Nanda Dhakal. 2016. A Tsum Lexicon. (Languages of the World/Dictionaries, 61.) München: LINCOM. 197pp.
- Liu, Naijing. 2015. Tsum tone: a challenge for typology and phonological description. (MA thesis, Australian National University).
- Webster, Jeff. 1992. A Socio-linguistic Survey of the Tibeto-Burman Dialects of North Gorkha District, Nepal. Ms.