How many Irish went to Argentina? Every number, and who gives it

Ask how many Irish people went to Argentina and you will be given anything from 7,000 to 50,000. Ask how many Argentines have Irish ancestry today and the answers run from 150,000 to over a million. None of these numbers is simply wrong, and none can be trusted on its own. They measure different things, in different years, by different methods, and the only honest way to use them is to say who gives each one and when.

Arrivals: 30,000 to 50,000

The widest figures count people who landed. Patrick McKenna's 1994 Maynooth thesis estimates that 40,000 to 45,000 Irish emigrated to Argentina in the nineteenth century, and calls any overall figure highly speculative: before 1861 it depends on the Irish chaplaincy's estimates, and after 1861 on assuming that two-thirds of "British" arrivals were Irish. His minimum is 36,800. His arithmetic leans on the Mulhall brothers, whose 1868 Handbook gave 30,000 Irish among 250,000 foreigners and whose 1872 edition gave an official figure of 10,709 "English", meaning all British, which implies about 9,370 Irish.

Edmundo Murray gives about 45,000 Irish emigrants arriving in Buenos Aires between 1830 and 1930, roughly half of whom returned or re-emigrated, mainly to the United States and Australia. Brad Lange gives about 30,000 between 1822 and 1945. The Argentine foreign ministry's 2017 catalogue says about 40,000 came from the second half of the nineteenth century, and IrishCentral says about 50,000 between 1830 and 1930.

Settlers: 7,000 to 11,500

The lower figures count people who stayed and left a trace. Helen Kelly's 2009 study puts the number who migrated at about 7,000. Sabato and Korol's 1981 settler figure of 10,500 to 11,500 is disputed, as Murray notes. The Society for Irish Latin American Studies analysed Eduardo Coghlan's genealogy and found 4,348 settlers from 3,667 family heads, fewer than the 7,159 records in a separate list of Irish passengers; it estimates 40,000 to 45,000 arrivals, about 20,000 settlers, and a core of 4,000 to 5,000 who left descendants. McKenna reckons Coghlan's records cover only 15 to 20 per cent of total emigration.

Why the gap between arrivals and settlers? Thousands died in the cholera and yellow-fever epidemics in Buenos Aires and Santa Fe, Murray writes. McKenna finds that Irish rural labourers fell by a third between the 1869 and 1895 censuses, and that those who re-emigrated were mostly aged 35 to 45. The two families of figures do not really contradict each other: one counts gross arrivals over 80 to 100 years, the other counts people who appear in censuses or genealogies.

What the censuses recorded

The censuses are the firmest ground, with one catch. Lange gives 5,246 Irish-born people in Buenos Aires province in 1869 and 4,693 in 1895; counting Argentine-born children, 8,623 and 16,284. By the early twentieth century, he finds, about 70 per cent of the city's Irish community was Argentine-born. María Eugenia Cruset, citing Korol and Sabato's reading of the 1869 returns, gives the same 5,246 and 8,623, and records 10,637 people from "Great Britain" in the whole country, 5,878 of them in the province. The catch is that in the 1869 returns many Irish appear as "ingleses" despite clearly Irish surnames, so any Irish count is partly a judgement about who was Irish.

Earlier signposts come one at a time. Pat Nally says about 300 Irish lived in Argentina by 1830. When Fahy landed in January 1844 the community was put at 3,500, Casey records from the British Packet. Fahy himself counted the colony at 4,500 in 1848, according to the school that bears his name. In October 1921 the Dáil's agent P.J. Little reported about 27,000 "English" in Argentina, a figure he thought included the Irish-born, and 40,000 to 50,000 people of Irish extraction, very few of them still Irish-born.

Descendants today: 150,000 to a million

Every present-day figure is an estimate of descent, not birth, and that is why they grow. Nally put Irish-descended Argentines at about 350,000 in 1992, and the Argentine foreign ministry used about 300,000 in 2001. The Irish Government estimates about 500,000 people of Irish descent, the largest such population outside the English-speaking world, mostly fourth and fifth generation because immigration ended before the First World War. The Buenos Aires city government used about 500,000 in 2022, the Universidad del Salvador's Irish studies chair says close to 500,000, and Argentina's ambassador to Ireland, Ana Laura Cachaza, said "more than half a million" in March 2026.

Higher figures exist. The foreign ministry's 2017 catalogue says over 600,000. Canal 26 gave 500,000 to a million in 2026. Wikipedia's infobox says 500,000 to 1,000,000, marks "roughly 650,000" as needing a citation, and tags its own "over 1,000,000" as failing verification. At the other end, a 2023 business-paper article seen only in a search summary gives about 150,000, which probably reflects a narrower definition or an error. None of the higher figures came with a published method in anything the research opened.

The sentence to use

Put together, the cautious wording is this: an estimated 40,000 to 45,000 Irish people sailed for Argentina in the nineteenth century; perhaps half stayed; and about 500,000 Argentines are of Irish descent today, on the Irish Government's estimate. Anyone who gives you one number without a name and a year attached is rounding somebody else's guess.