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
Wales' hopes of qualifying for the 2018 World Cup took a dent following a goalless draw with the Republic of Ireland in Dublin.
Clear skies overnight will set us up for a beautiful weekend with sunshine and lovely temperatures.
Shopping trolleys to be left unlocked as supermarket upgrades for new £1 coin.