The Perth electorate of Hasluck is likely to be split in a federal electoral redistribution that would give the Coalition an extra seat in Western Australia, analysts say.

The new WA seat would come at the expense of a seat in regional New South Wales, taking WA's total number of electorates from 15 to 16.

The Australian Electoral Commission (AEC) will begin determining the number of electoral divisions each state is entitled to from November 12, one year since the new Parliament sat, as required by the Commonwealth Electoral Act.

The commission will use the latest published Australian Bureau of Statistics (ABS) population figures, released in March, to make its determination within a month.

An analysis of ABS data earlier this year by the federal parliamentary library's statistics and mapping section predicted WA would achieve a quota of just over 16 electoral divisions, giving it one extra seat, while NSW would lose one.

ABC electoral analyst Antony Green said the March figures confirmed NSW would lose its third electoral division in nine years and WA would gain its first since 2000.

"The numbers will show NSW is only entitled to 47 seats, not the 48 it currently has, and Western Australia will be entitled to 16, not the 15 it currently has," Mr Green said.

NSW would lose a rural rather than city seat, Mr Green said, as a result of regional population shortages. The Hunter and Riverina electorates could be abolished to form one seat.

In WA, a new seat would most likely be formed by splitting Hasluck, currently held by Liberal Ken Wyatt.

"I think that's more likely to be divided in two," Mr Green said.

"There'll be a seat which is in the north which is based around Midland and a seat in the south based around Gosnells and Armadale."

With 1.487 million people enrolled to vote in WA as of June, each of the 16 seats would have about 90,000 voters.

Pearce may be redrawn

Mr Green said the seat of Pearce, which currently has 106,000 voters and is mostly a rural electorate, could be completely re-drawn out of the metropolitan area.

Urban sections like Ellenbrook could be sliced off and added to the new seat.

The electorate of Canning, which also has 106,000 enrolled voters, could lose the urban areas of Armadale and Kelmscott to a re-shaped Hasluck.

"That leaves room for the current Hasluck to slip south of the river, and once you've got all that, you've got enough room north of the river for a seat," Mr Green said.

"You get one seat south of the airport and one seat north of the airport, roughly."

Notre Dame University political lecturer Martin Drum agreed.

"Canning and Pearce are odd seats at the moment because they have rural and metro areas in them," Dr Drum said.

"When you're naturally going to change seats, you'd take the north western part of Pearce and and include that in a north-eastern seat."

That new seat could be based around the City of Swan and Mundaring.

The newly constituted Hasluck, to the south, would stretch south of Midland to Armadale and include the northern part of Canning.

Dr Drum did not believe Labor would improve on the three seats it currently holds in any redistribution.

"Both of those seats would be Liberal held seats nominally, but if Labor did exceptionally well in Western Australia, they wouldn't be out of reach," he said.

Mr Green said Labor MP Alannah MacTiernan's hold on the seat of Perth could be under threat if the new seat extended into the eastern end of her electorate.

"The seat which would be most in danger for Labor would be Perth," he said.

"Any changes to Brand in Fremantle are likely to secure them for Labor. But the consequences up the river, around the eastern end of Perth means Perth may struggle."