Australia’s biggest national survey, the Census, is on Tuesday night with the details to be used to plan for the future, including infrastructure like schools, hospitals and roads. The Census happens every five years, a national survey Australians have been taking part in since 1911. WATCH THE VIDEO ABOVE: Everything you need to know about Census nightKnow the news with the 7NEWS app: Download today ArrowIt helps inform all sorts of things like government policy, infrastructure, health services and schools. You need to include everyone who will spend the night at your home on Census night, including those who may just be visiting and those who usually live there but are away. If you’re travelling in Australia, you still need to do the Census, but those overseas don’t.