The country's next census will take place on Sunday April 3rd.
Carried out by the CSO, it provides a complete picture of the social and living conditions in Ireland.
It is taking place one year after its initial date, as a result of the COVID-19 pandemic.
An enumerator will deliver a census form to every home between February 28th and census day.
They will then return to collect the completed form between April 4th and May 6th.
Everybody present in the country on Census Night must be included - it's the law.
There are 11 household questions and 33 questions to be completed for up to six individual people who are present in the household.
There also a number of new questions included on renewable energy sources, internet access, smoke alarms, smoking, working from home, volunteering, childcare and travelling home from work, school or college.
These topics were selected after a public consultation in late 2017.
Many other questions - such as those on religion and long-lasting conditions - have also been changed.
The form is available in 22 different languages, including Irish.
Also included this year is a new Time Capsule, where people can leave a message to be revealed in 100 years.
This is a dedicated space at the end of the census form for you to leave a message, if you wish, for future generations and historians.
The CSO says: "Your message can be about anything you want, to anyone you want.
"Like the rest of your form, it will remain confidential until all of the Census 2022 forms are released to the public in 2122.
"The Time Capsule is completely voluntary, and it is entirely up to you whether you wish to write anything here or not.
"The only thing we ask is that you do not add any paper, documents, photos or anything attachable as we will not be able to preserve them or return them to you", it adds.