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".
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There are already 17 directly elected Mayors in England but none across the border so far.
Bristol Airport says abolishing air passenger duty in Wales would result in passengers and airlines flying from Cardiff instead.
An additional £7 million has been put aside by the Welsh Government to build in areas where the housing supply is low.