Mr McCormack addressed supporters just before 9.30pm on the night of the election, with the Australian Electoral Commission predicting he would win almost 70 per cent of two-party preferred vote.

"It has been a very, very good night locally and potentially it is going to be a very, very, very good night nationally," he said.

"I want to than and congratulate Michael Bayles from the Greens, Mark Jeffreson from the Labor Party and Richard Foley from the United Australia Party.

"They ran a respectful campaign, they ran a solid campaign and they put their hands up for public office and it takes a bit courage to take part in the democratic process and I wish them well."

It is less certain whether Mr McCormack will return as Deputy Prime Minister, with the national result still close but many analysts have predicted it would be difficult for Labor to win power with their results on Saturday night.

Mr McCormack thanked his volunteers for having "done the National Party proud once again" and thanked his campaign team, office staff and family.

"I couldn't do it without you," he said.

"This seat has been held by the National party for a long, long time and it is because we keep turning up, we keep delivering and we have got people in yellow T-shirts who keep standing out on the cold cement for three weeks of pre-poll.

"That should be adjusted; it should be a week."

Riverina Greens candidate Michael Bayles has offered his congratulations to Mr McCormack for a convincing win.

Mr Bayles said the Greens were happy with a likely six per cent share of the vote, up 1.7 per cent from 2016, as Riverina was a "very conservative" electorate.

Mr Jeffreson wished Mr McCormack "the best for the next three years".

"I've spoken with him and congratulated him on his win," he said.

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Mr Foley said he was proud to have doubled his primary vote since his run as an independent in 2016.

"Congratulations to Michael McCormack, it was an absolute caning," Mr Foley said.

"The Labor Party needs to snap out of it and get back to its roots."

With more than 70 per cent of the votes counted, Mr McCormack's primary vote in Riverina was just over 60 per cent, representing a positive swing of more than 3.4 per cent compared with the 2016 federal election.

Labor's Mark Jeffreson had just over 23.5 per cent, United Australia Party's Richard Foley had just under 10.6 per cent of the vote and the Greens' Michael Bayles had 5.8 per cent.

MORE TO COME