|Name meaning||The eastern buffalo breeders|
|Date of depopulation||March 17, 1948|
|Cause(s) of depopulation||Fear of being caught up in the fighting|
Al-Jammasin's inhabitants were known to be descendants of nomads from the Jordan Valley. In 1596, a Jammasin (Masra'at Hasana) tribe appear in the Ottoman census, located in the Nahiya of Bani Sa'b of the Liwa of Nablus, paying taxes on goats, beehives and water buffalos. Khalidi writes that judging from the absence of taxes on any crops, this Masra'at (farm) probably specialised in short-distance herding and semi-nomadic tasks. The tribe was known to have settled in the area by the 18th century.
British Mandate era
In the 1922 census of Palestine conducted by the British Mandate authorities, the tribal area of Jammasin had a population of 200 Muslims, while in the 1931 census Jammasin esh-Sharqiya had 395 Muslim inhabitants.
In the 1945 census the population of Al-Jammasin al-Sharqi consisted of 730 Muslims and the land area was 358 dunams of land, according to an official land and population survey. Of this land, Arabs used 53 dunams for citrus and bananas, 193 for plantations and irrigable land, 40 for cereals, while a total of 18 dunams were non-cultivable areas.
In December, 1947, Jewish agents reported that Arabs were leaving the Al-Jammasin villages. In December 1947 and January 1948 the leaders of al-Shaykh Muwannis, Al-Mas'udiyya, Al-Jammasin al-Sharqi/Al-Jammasin al-Gharbi, and the mukhtars of Ijlil al-Qibliyya, Ijlil al-Shamaliyya and Abu Kishk met with Haganah representatives in Petah Tikva. These villages wanted peace, and promised not to harbor any Arab Liberation Armies or local Arab Militia. They further promised that, in the case they were not able to keep them out alone, they were to call on Haganah for help. The Jammasin villages, together with Abu Kishk, also jointly approached a Jewish police officer at Ramat Gan.
- Khalidi, 1992, p. 245
- Department of Statistics, 1945, p. 27
- Government of Palestine, Department of Statistics. Village Statistics, April, 1945. Quoted in Hadawi, 1970, p. 52
- Morris, 2004, p. xviii, village #204. Also gives cause of depopulation.
- Hütteroth and Abdulfattah, 1977, p. 141. Cited in Khalidi, 1992, p. 245
- Barron, 1923, Table VII, Sub-district of Jaffa, p. 20
- Mills, 1932, p. 17
- Government of Palestine, Department of Statistics. Village Statistics, April, 1945. Quoted in Hadawi, 1970, p. 95
- Government of Palestine, Department of Statistics. Village Statistics, April, 1945. Quoted in Hadawi, 1970, p. 145
- Morris, 2004, p. 67
- Morris, 2004, p. 91
- Morris, 2004, p. 92, note #143, p. 145
- Barron, J. B., ed. (1923). Palestine: Report and General Abstracts of the Census of 1922. Government of Palestine.
- Department of Statistics (1945). Village Statistics, April, 1945. Government of Palestine.
- Esber, Rosemarie M. (2008). Under the Cover of War, The Zionist Expulsions of the Palestinians. Arabicus Books & Media. ISBN 0981513174.
- Hütteroth, Wolf-Dieter; Abdulfattah, Kamal (1977). Historical Geography of Palestine, Transjordan and Southern Syria in the Late 16th Century. Erlanger Geographische Arbeiten, Sonderband 5. Erlangen, Germany: Vorstand der Fränkischen Geographischen Gesellschaft. ISBN 3-920405-41-2.
- Hadawi, Sami (1970). Village Statistics of 1945: A Classification of Land and Area ownership in Palestine. Palestine Liberation Organization Research Center.
- Khalidi, Walid (1992). All That Remains: The Palestinian Villages Occupied and Depopulated by Israel in 1948. Washington D.C.: Institute for Palestine Studies. ISBN 0-88728-224-5.
- Mills, E., ed. (1932). Census of Palestine 1931. Population of Villages, Towns and Administrative Areas. Jerusalem: Government of Palestine.
- Morris, Benny (2004). The Birth of the Palestinian Refugee Problem Revisited. Cambridge University Press. ISBN 978-0-521-00967-6.