The May election win makes it five-in-a-row for newly re-elected Liberal MP Rowan Ramsey, who also retains his status at the Government Whip
Australian Electoral Commission divisional manager Jacqui Dunlop said all votes have now been counted, with Mr Ramsey a clear winner.
Mr Ramsey won comfortably with 52,392 votes or 50.6 per cent.
His biggest challenge came from Labor Party candidate Karin Bolton with 23,612 votes (22.8 per cent)
Despite narrowing the Liberal Pary's margin from 14 per cent to 1.8 per cent in the 2016 election, Centre Alliance candidate Andrea Broadfoot managed to wrangle only 5324 votes - just 5.1 per cent.
Mr Ramsey noted the 12.2 per cent swing in his favour.
"From my point of view it was a lot better result for me and for the Liberal party in the electorate of Grey this time around than last time when there was a push from the (former) Xenophon party, which turned things a little bit differently then," he said.
"That didn't have the same influence this election that must be said."
Despite the recent boundary shifts in Grey, making it the nation's third largest electorate, Mr Ramsey said he is excited to be re-elected to serve for another term.
"Nationally, I am very very pleased with the result to be able to continue as government and for our electorate that has been very valuable with the amount of projects we have been able to deliver or commit to," Mr Ramsey said.
"I am looking forward to a lot of that work being able to take place over the next three years and making sure we get on with the job."