The Central Statistics Office (CSO) has appealed to those who have not had their census form collected to return the form by post without delay.
In a statement, the CSO thanked enumerators and the general public for their support of and participation in Census 2022.
The CSO advised that enumerators are now completing their collections and if a household's form has not yet been collected they are asked to return it by post which can be done free of charge.
"By law, everyone who was present in the country on Census night must be recorded on a form, so it is really important that the completed forms are returned to us now," Eileen Murphy, head of census administration said.
Once the 2 million forms are all returned to the Census Head Office in Swords, they will be scanned, and the data analysed before being published as anonymised statistics.
Preliminary population figures from Census 2022 are expected to be published by mid-summer.
Census forms can be posted to: Central Statistics Office, PO Box 2021, Freepost 4726, Swords, Co. Dublin, K67 D2X4.