Just over 1.7 million forms have been collected
The Central Statistics Office (CSO) is asking those who have not yet had their Census 2016 forms collected to post them.
It says just over 1.7 million forms have now been collected across the country.
It says enumerators in some areas are still calling to collect forms, but will conclude their work this Friday May 27th.
All householders are being asked to return their census form by post if it has not yet been collected.
Deirdre Cullen, senior statistician at the CSO, says: "Not every householder has managed to have contact with their enumerator and some people have already begun to post their forms to the CSO".
"We've received over 15,000 forms by post over the past three weeks, and 3,000 since Monday this week".
It says in some parts of Dublin city , Galway, Limerick and Waterford city - as well as parts of Donegal - it is proving challenging for enumerators to make contact with householders.
Ms Cullen is reminding householders about the importance of the census: "Because of the importance of census data in decisions for local areas it's absolutely critical that everyone is included in the census, and that every form is returned to the CSO".
First results will be published in July.
Census forms can be posted to: PO Box 2016, FREEPOST F4726, Swords, Co Dublin. Anyone with a query can call the Census helpdesk on 1850-2016-04.