The Australian Electoral Commission has seen a record increase in Indigenous enrolment ahead of the Voice to Parliament referendum.

An estimate recorded in February of 2023 has shown an additional 21,000 Indigenous Australians have enrolled to vote between the end of June until the end of December 2022.

The national estimated Indigenous enrolment rate has risen to 84.5 per cent, a 2.8 per cent increase in less than six months.

Electoral commissioner Tom Rodgers said there have been significant increases in the last six months.

"What this means is more people are ready to vote when they turn up to a polling place during an election or Referendum, or when an AEC remote voting team comes to visit," he said.

"The estimated number of 'unenrolled' Indigenous Australians has gone under 100,000 for the first time, to just under 87,000 and that is significant."

While there's been an increase in Indigenous enrollment, advocacy group GetUp is calling for more work to ensure this number continues to increase.

GetUp found a reduction of staff working in First Nations electorates meant polling sites were only open for a small period of time.

This resulted in it being more difficult for First Nations people to vote if they were enrolled.

GetUp's executive officer, Widjabul Wia-bal woman Larissa Baldwin-Roberts, said increased enrolment in First Nations communities is not equivalent to increased voter turnout.

"We saw that while enrolment numbers had increased across the board for First Nations communities, voter turnout for the 2022 federal election had decreased significantly from the previous election," she said.

"During the federal election the AEC, in some cases, only turned out to community for an hour - we need to ensure these electoral booths are a top priority during the referendum vote and the booths are fully operational before or on voting day, as we continue to prioritise our work to ensure communities turn out to vote.

"There is significant practical work to be done, including increasing accessibility, education, translators at the booths, election notices in communities and ensuring the AEC has a longer presence in communities."

Current states with the most Indigenous Australians enrolled are New South Wales and Tasmania with 91.3 and 91.6 per cent enrolled respectively.