A Senior Statistician at the CSO has said that the increase in the 2016 census in the number of households with both Irish and non-Irish members indicates that more people of foreign extraction are putting down roots here and having children.
Speaking on RTÉ News at One, Deirdre Cullen said that there has been a virtual doubling since the last census of the number of people classifying themselves as having dual Irish and other nationality.
The figure in 2011 was 55,905 while last year it stood at 104,784, marking an increase of 87%.
She said that this could account for the 1.6% drop in non-Irish nationals recorded in the most recent census.
People may identify as having a dual nationality based on what citizenship they hold, where they were born, where they live or where their parents are from. In the case of the dual Irish nationals identified in last year's census, 66,440 - or 63.4% of them - were born abroad. However, this ratio varied depending on which other nationality they identified as.
When asked which of today's finding she, as a statistician, thought was the most interesting, Ms Cullen said: "To me, it's the increase in the mixed Irish-non-Irish households and that idea that people who have arrived are here to stay, they're putting down roots, they're having children.
"We've seen a small increase in the number of Polish, Lithuanian and Latvian households who are homeowners now. The populations are slowly ageing.
"So the average age of the Polish in Ireland has increased by 3.6 years in just 5 years whereas the average age of Irish nationals has increased by just a year."
The returns show that 86% of Irish-UK nationals were born abroad, and comprised the largest group in this category. Over 80% of Irish-Filipino, Irish-Indian and Irish-South African nationals were born abroad while Irish-Canadians and Irish-Australians were most evenly split between persons born in Ireland and born abroad.
At the other end of the scale, over 70% of the Irish-Lithuanians, Irish-Spanish and Irish-Polish people were born here.
The CSO says the largest cohort of dual Irish nationals was under the age of 15 followed by persons in their 40s.
Over 70% Irish-Polish nationals were under the age of 15 compared with just 14.1% of Irish-UK nationals.
Among the cities, Galway was the most multicultural, with 18.6% of its resident population recorded as non-Irish.
Slightly more than17% of Dublin City residents and one in six of Fingal residents were non-Irish nationals.
Non-Irish nationals are more likely to be unemployed, with a rate of 15.4% compared to 12.6% among the Irish population.
They are also more likely to work in more manual jobs - 46.9% were in non-manual, manual skilled, semi-skilled or unskilled compare to 39.2% of Irish nationals
Non-Irish nationals arealso younger - half of non-Irish nationals were aged between 25 and 42 years of age,compared to just a quarter of the Irish population.
The number of people speaking a foreign language at home has increased by 19% since the last census, with the top languages being Polish, Lithuanian and Romanian.
Of those speaking a foreign language at home - more than600,000 people - 40% were Irish citizens.
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