Booth-to-booth data issued by the Australian Electoral Commission on Sunday has shown a decrease across 78 of the 100 booths.

Informal voting dropped by 3.93 per cent in Woden and 3.52 per cent in Parkes, while only 10 informal votes were cast among the 184 total in Oaks Estate.

However both the seat of Canberra and the seat of Fraser reported increases in 11 booths.

Increases as large as 4.61 per cent were recorded in Wreck Bay, as well as 2.41 per cent in Belconnen and 2.22 per cent in Tharwa.

There were also several increases recorded in Eden-Monaro, where nine of the 22 booths reported jumps in informal voting.

Booths in Bega and Bibbenluke recorded increase of 1.54 and 2.69 per cent respectively, while polls in Broulee and Bermagui saw falls of 3.65 per cent and 2.81 per cent.

Nationally, there has been a 0.34 per cent increase in informal voting.

The Australian Electoral Commission had recorded 666,189 informal votes as of 1pm on Monday, accounting for 5.89 per cent of the total count.

Australian Electoral Commission spokesman Phil Diak says the informal vote statistics were based on current figures and could flatten out, particularly once more postal votes are counted.

But it's likely to stay relatively high, he says.

''It looks like at 5.9 per cent it will stay above the last federal election,'' Mr Diak told ABC television.

He says the commission has so far counted 11.2 million lower house votes and 10 million Senate votes.

A vote is counted as informal if it is not marked at all or if it is filled out incorrectly.

It can also be counted as informal if the ballot paper has writing on it that identifies the voter.

- with AAP.