That's according to the latest Census figures.
The latest Census figures show that there were over 5.1 million people in the State on Census night, which took place in April last year.
That is an 8% (387,274 people) increase on April 2016 figures.
County Kildare's population increased by 11%, while the county continued to be one of the counties with the youngest age on average, at 36.9.
Nationally, the population includes more females than males.
There are 2.6 million females living in the country compared to 2.5 million males.
Some Students In Caragh & Kill Left Stranded On Roadside This Morning, As Naas School Buses Don't Show
Over One Million Euro In Funding Allocated To Repairs And Improvements For Rural Roads And Laneways Across Kildare
Sewerage Flowing Into Canal From The Harbour In Naas Down To Osberstown Bridge
Public Meeting Takes Place Tonight Regarding The Proposed Housing Of Refugees In West Wicklow
Kildare County Council "Aware" Of Issues With Water Supply At St Conleth's Cemetery In Newbridge
Roadworks Get Underway On The Road From Brannockstown To Ballymore Eustace
Water Supply To Be Disrupted On The Stradbally Road In Athy For Next Few Days
Proposal To House Up To 12 International Protection Applicants In Single House In Newbridge Housing Estate
