The South Australian branch of the National Party is at risk of being dissolved, prompting Federal MP Barnaby Joyce to beg for new members urgently.

Key points: Federal Nationals MP Barnaby Joyce on Thursday called for more people to join the party

Federal Nationals MP Barnaby Joyce on Thursday called for more people to join the party It needs to prove it has at least 200 members in SA by 5:00pm on Friday

It needs to prove it has at least 200 members in SA by 5:00pm on Friday If not, it could be deregistered by the South Australian Electoral Commission

The SA Nationals currently have no representatives in either the State or Federal parliaments.

Mr Joyce on Thursday said the party needed evidence it had 200 members by 5:00pm on Friday to remain registered with South Australia's electoral commission.

"I can't see any reason why in the future we can't once more invigorate South Australia to the spot where it is sending both senators to Canberra and hopefully Lower House members to Canberra," he said.

"It is something that I believe is absolutely important for South Australia, for our nation and most definitely for the National Party."

Deputy Electoral Commissioner for South Australia David Gully said all parties were written to in June, with the commission asking them to provide evidence they were still eligible to be a registered political party.

A political party in South Australia needs either a member of Parliament or 200 members who are on the electoral roll to register.

All parties were initially given a September deadline to provide evidence, however the Nationals were given two extensions.

"We gave them an extra month until the end of October to give us those declarations, they then came back and asked for another extension," Mr Gully told the ABC's Late Afternoons program.

"What we've now done is given them until tomorrow to show cause why they should not be deregistered."

The Nationals have not had a federal MP in South Australia since Karlene Maywald in 2010.

The Nationals have not had a member of Parliament since Karlene Maywald in 2010. ( ABC News: Simon Royal )

Mr Joyce on Thursday reiterated the need for the Nationals to have a presence in South Australia's political landscape.

"We've got to have more than just a Coles and Woolworths of politics," Mr Joyce said.

"In South Australia, with the demise of Cory Bernardi's Conservative Party and of Family First, it would be terrible to see the loss of the South Australian Nationals as well."

Losing the Nationals would be an 'absolute tragedy'

Federal Nationals vice-president James Hayward on Thursday said the party did have enough members in the state, however, it was having trouble getting them all to sign a declaration.

"We've always had over 200 members, the issue is that they've got to sign a declaration and that's been a little bit challenging," he told the ABC.

"One of the challenges is that some of them are getting a little bit older."

He said the party had run a campaign over the past couple of weeks to try and encourage people to get behind the party.

"We're quite confident we will have all the requirements met by tomorrow afternoon," he said.

"It would be an absolute tragedy to see the National Party deregistered in this state."

Mr Gully said while the Nationals had until Friday, four other parties had already been deregistered by the commission.

They were the Dignity Party, the Liberal Democrats, Stop Population Growth Now and the Danig Party of Australia.