It's an increase of 7.6% in six years.
The population of the Republic of Ireland is now the highest it has been since pre-Famine times.
There are now 5.1 million people here, an increase of 7.6 per cent in six years.
It is the highest population recorded in a census since 1841 and the first time the population exceeded 5 million since 1851.
The results showed that all counties experienced population growth since the 2016 census.
Longford recording the biggest percentage increase at 14 per cent, followed by Meath with 12.9 per cent.

Jim Gavin Was Asked About Tenant Dispute Twice Before Being Selected As Fianna Fáil Presidential Candidate
Three Motorists Fined During Naas School Run As Children Were Not Wearing Seatbelts
New €53m Falcon 6X Joins Irish Air Corps Fleet
Sixteen Kildare Residents Died From Drug Poisoning Over A Two-Year Period
Fatal Celbridge Crash: Driver Jailed After Leaving Scene Without Reporting Friend Inside Car
Gardaí Search Five Premises In Kildare, Dublin And Tipperary As Part Of Housing Sector Probe
80 Drug-Driving Cases Before Naas Court So Far This Year Amid Calls For Tougher Penalties
Electricity Bills To Increase Next Year As Households To Shoulder Majority Of Power Grid Overhaul