How large is the Irish diaspora?
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The Government of Ireland defines the Irish diaspora as all persons of Irish nationality who habitually reside outside of the island of Ireland. This includes Irish citizens who have emigrated abroad and their children, who are Irish citizens by descent under Irish law. It also includes their grandchildren in cases where they were registered as Irish citizens in the Foreign Births Register held in every Irish diplomatic mission. Under this legal definition, the Irish diaspora is considerably smaller—some 3 million persons, of whom 1.47 million are Irish-born emigrants. Given Ireland's population of 4.85 million, this is still a large ratio.
However, the usage of "Irish diaspora" is generally not limited by citizenship status, thus leading to an estimated (and fluctuating) membership of up to 80 million persons—the second and more emotive definition. The Irish Government acknowledged this interpretation—although it did not acknowledge any legal obligations to persons in this larger diaspora—when Article 2 of the Constitution of Ireland was amended in 1998 to read ""[f]urthermore, the Irish nation cherishes its special affinity with people of Irish ancestry living abroad who share its cultural identity and heritage.""
Irish diaspora
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After 1840, emigration from Ireland became a massive, relentless, and efficiently managed national enterprise. In 1890 40% of Irish-born people were living abroad. By the 21st century, an estimated 80 million people worldwide claimed some Irish descent, which includes more than 36 million Americans who claim Irish as their primary ethnicity.
As recently as the second half of the nineteenth century, the majority of Irish emigrants spoke Irish as their first language. This had social and cultural consequences for the cultivation of the language abroad, including innovations in journalism. The language continues to be cultivated abroad by a small minority as a literary and social medium. 
The Irish People are largely assimilated in most countries outside Ireland
Irish diaspora
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The term Irish diaspora is open to many interpretations. The diaspora, broadly interpreted, contains all those known to have Irish ancestors, i.e., over 100 million people, which is more than fifteen times the population of the island of Ireland, which was about 4.6 million in 2011. It has been argued the idea of an Irish diaspora, as distinct from the old identification of Irishness with Ireland itself, was influenced by the perceived advent of global mobility and modernity. Irishness could now be identified with dispersed individuals and groups of Irish descent. But many of those individuals were the product of complex ethnic intermarriage in America and elsewhere, complicating the idea of a single line of descent. "Irishness" might then rely primarily on individual identification with an Irish diaspora.
Irish diaspora
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A specific 19th-century example is the Irish diaspora, beginning in the mid-19th century and brought about by "An Gorta Mór" or "the Great Hunger" of the Irish Famine. An estimated 45% to 85% of Ireland's population emigrated to areas including Britain, the United States of America, Canada, Argentina, Australia and New Zealand. The size of the Irish diaspora is demonstrated by the number of people around the world who claim Irish ancestry; some sources put the figure at 80 to 100 million.
Diaspora
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The largest Irish communities in Britain are located predominantly in the cities and towns: in London, in particular Kilburn (which has one of the largest Irish-born communities outside Ireland) out to the west and north west of the city, in the large port cities such as Liverpool (which elected the first Irish Nationalist members of parliament), Glasgow, Bristol, Sunderland and Portsmouth. Big industrial cities such as Salford, Manchester, Luton, Coventry, Birmingham, Sheffield, Wolverhampton, Cardiff and parts of Newcastle and Nottingham also have large diaspora populations due to the Industrial Revolution and, in the case of the first three, the strength of the motor industry in the 1960s and 1970s. Crosby, Kirkby, Rugby, Denbigh, Widnes, Ilfracombe, Bootle, Huyton, Birkenhead, Gateshead, Seaham, Middlesbrough, Wallasey, Moreton, Batley, Bolton, Barrhead, Winsford, Ellesmere Port, Chester, Blantyre, Runcorn, Ashton-under-Lyne, Heywood, Consett, Bishop Auckland, Cambuslang, Ashton-in-Makerfield, Solihull, Brighouse, Clydebank, Easington Colliery, Litherland, Whitehaven, Barrow-in-Furness, Irlam, Newton Mearns, Chatham, Greenock, Port Glasgow, Prestwich, Holyhead, Fishguard, Caistor, Saltney, Cleator Moor, Newport, Maghull, Washington, North Shields, South Shields, Tynemouth, Paisley, Stockport, Haslingden, Dewsbury, Skelmersdale, Keighley, Chorley and parts of Market Harborough, Devon and Greater Manchester have high concentrations of Irish communities. The towns of Hebburn, Jarrow and Coatbridge have famously all earned the nickname 'Little Ireland' due to their high Irish populations.
Irish diaspora
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According to US Census figures from 2000, 41,000,000 Americans claim to be wholly or partly of Irish ancestry, a group that represents more than one in five white Americans. Many African Americans are part of the Irish diaspora, as they are descended from Scots-Irish slave owners and overseers who arrived in America during the colonial era. The US Census Bureau's data from 2016 reveals that Irish ancestry is one of the most common reported ancestries reported (in the top 3 most common ancestries reported). Even though Irish immigration is extremely small relative to the scope of current migration, Irish ancestry is one of the most common ancestries in the United States because of the events that took place over a century ago.
Irish diaspora
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Ontario has over 2 million people of Irish descent, who in greater numbers arrived in the 1820s and the decades that followed to work on colonial infrastructure and to settle land tracts in Upper Canada, the result today is a countryside speckled with the place names of Ireland. Ontario received a large number of those who landed in Quebec during the Famine years, many thousands died in Ontario's ports. Irish-born became the majority in Toronto by 1851.
Irish diaspora
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About 10% of the population of Saskatchewan during 1850–1930 were Irish-born or of Irish origin. Cottrell (1999) examines the social, economic, political, religious, and ideological impact of the Irish diaspora on pioneer society and suggests that both individually and collectively, the Irish were a relatively privileged group. The most visible manifestations of intergenerational Irish ethnicity - the Catholic Church and the Orange Order - served as vehicles for recreating Irish culture on the prairies and as forums for ethnic fusion, which integrated people of Irish origin with settlers of other nationalities. The Irish were thus a vital force for cohesion in an ethnically diverse frontier society, but also a source of major tension with elements that did not share their vision of how the province of Saskatchewan should evolve.
Irish Canadians
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The Irish Exiles is a rugby union representative team featuring players selected from the Irish diaspora, mainly though not exclusively based in Great Britain. The team was established in 1989 by Tom Kiernan. It was officially recognised by the Irish Rugby Football Union and during the 1990s was effectively a fifth provincial team along with Leinster, Ulster, Munster and Connacht. Between 1992–93 and 1995–96 the Irish Exiles entered the IRFU Interprovincial Championship. The Irish Exiles also acts as an academy system for players from the Irish diaspora who wish to play for the men's national team and other IRFU national teams including the women's national team, the men's sevens team and the women's sevens team.
Irish Exiles (rugby union team)
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The Diaspora population of Ireland also got a fresh start on the islands of New Zealand during the later half of the 19th century. The ideology of striking it rich in the gold mines caused many Irish people to flock to the docks; risking their lives on the long voyage to potential freedom and more importantly self-sufficiency. Most famous places including both Gabriel's Gully and Otago are examples of mining sites which, with the funding of large companies, allowed for the creation of wages and the appearance of mining towns. Women found jobs as housemaids cleaning the shacks of the single men at work thereby providing a second income to the Irish family household. The subsequent money accumulated with regards to this would allow for chain migration for the rest of the family left behind.
Irish diaspora