The 2021 Census website, including the online form, and customer service channels will close on Friday, 1 October.
"The website and online form have been available since 28 July but will soon close - now is your last opportunity to submit your Census form.Australian Statistician," Dr David Gruen said.
"Households that haven't completed the Census need to do so this week. Online forms can be submitted unline ntil Friday, 1 October at 3:00pm AEST. If you don't have your Census letter, you can go online and complete today. Select the 'Get a Census Number' option.
"People who haven't yet returned a completed paper form need to do so today using the reply-paid envelope provided".
As of Tuesday, 28 September, more than 10 million households have completed the 2021 Census.
"It's critically important that everyone participates and well over 90 per cent have already done so. But no community is too small to count, we want to make sure everyone is represented," Dr Gruen said.
Under the Census and Statistics Act 1905, the Census is compulsory. The Australian Statistician can issue people with a Notice of Direction, which directs people in writing to complete the Census and fines can apply if the Notice of Direction is not complied with.
The ABS will publish a final response rate for the 2021 Census with the first release of Census data in June 2022.
Census data is used to inform important decisions about transport, schools, health care, infrastructure and business at the community and national level.
To complete the census online go to: https://www.census.abs.gov.au/