Today's census figures will focus on international migration, ethnic groups and religion - and the Welsh language.
Some parents like Rhian Cecil hope it'll lead to more Welsh medium and bilingual schools over the next ten years.
"It's really important for us as Welsh speakers to be stood up and counted".
"Hopefully all the figures can help local councils create more provision".
More top news
The whale is made of bags, bottles and other single-use plastics pulled from the ocean, beach and recycling plants.
Skies will cloud over with outbreaks of rain and drizzle.
An article in The Sunday Times found Isis used a network of companies operating out of an office in Cardiff to finance terror plots.