Almost 6000 Canberra residents have been added to the electoral roll ahead of the upcoming postal survey on same-sex marriage.
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More than 288,000 people in the ACT are eligible to participate in the survey, according to the Australian Electoral Commission.
Between the 2016 federal election and the time the rolls closed for the survey on August 24, the territory gained an additional 5980, an increase of 2.1 per cent.
Among Canberra's new voters who can participate in the optional survey are 3819 newly-turned 18-year-olds.
The largest demographic, however, are voters aged over 70, with more than 33,500 people, or 11.6 per cent of the electorate.
The electoral commission confirmed more than 16 million Australians are eligible to vote in the survey, the largest electoral roll since Federation.
Between August 8 and August 24, 98,000 new people were added to the electoral roll, with 65,000 of these aged between 18 and 24.
Electoral commissioner Tom Rogers said data from the electoral roll had been provided to the Australian Bureau of Statistics, who will run the survey.
"Over 3.3 million people visited the AEC website in the two weeks leading up to the close of rolls, compared to an average fortnight of around 90,000 visitors," he said.
In the same 16-day period, 933,592 enrolment transactions were processed by the commission, with 87 per cent of those being changes or updates.
Most of the changes or updates were made from people aged between 25 and 39.
By comparison, there were 687,000 transactions in the lead up to the electoral roll closing before the 2016 federal election.
