Census night is next Tuesday, August 10, but the Australian Bureau of Statistics says people are able to complete their Census as soon as they receive their instructions.

"We know people expect flexibility and convenience, so this makes it easier for people to fill in their Census when it best suits them," Census executive director and national spokesman Andrew Henderson said.

"Households across the country have started receiving Census letters with instructions on how to complete their Census online, or how to order a paper form.

"In some areas, households will receive a paper form and we'll supply a reply-paid envelope for its return.

"If you are yet to receive your Census instructions, or would like to complete a separate Census form to the rest of your household, you can get a Census number or request a paper form on the Census website.

"We want to make sure everyone is included in the Census, so we have provided a range of help and support options to assist people in completing the form, including on the Census website and over the phone.

"We also have braille forms, audio instructions, video guides with closed captions, and translation services available."

Mr Henderson said the Census data provides "a snapshot of who we are and how we are changing".

"It's used to inform important decisions about social and economic services for individuals, families and communities," he said.

"If you won't be home on Census night, it's important that you visit the Census website to report that the home will be vacant.

"You need to indicate whether the residents are staying elsewhere or travelling."

For more information, visit www.census.abs.gov.au.