Millions of Australians have been surveyed by the Australian Bureau of Statistics over the past two months, asking their thoughts on whether Australia's marriage laws should be changed.

However, for an estimated 23,000 Australians, it won't be the only survey they'll be required to answer for the bureau this year.

The ABS is conducting the survey of more than 23,000 households. Credit:Melissa Adams

The bureau is currently undertaking one of its largest surveys outside of the census, with work on the survey of income and housing under way.

The survey is conducted every two years and will run until June 2018.