Preliminary findings from Census 2016 show that Ireland's population rose to 4,757,976, up almost 170,000 since the last census in 2011.
The Central Statistics Office said changes in population varied widely across the country, with Fingal growing by more than 8 per cent, but Donegal falling by 1.5 per cent.
Among the fastest growing counties were the four administrative areas of Dublin, along with the commuter belt counties of Meath, Kildare and Laois and the cities of Cork and Galway.
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