Incoming Member for Mallee Anne Webster has expressed her gratitude to Wimmera residents who voted for her.
The National Party representative is the first woman to hold the seat.
However, the National Party is also on track to record 26 per cent fewer first preference votes compared to the 2016 election.
On Sunday, with 80 per cent of the votes counted, Dr Webster had received 29.5 per cent of the primary vote and two thirds of the two-candidate preferred compared to Labor's Carole Hart.
This represents an overall swing against the Nationals of three per cent in Mallee.
On Saturday night, Dr Webster said she was humbled and optimistic, though did not directly acknowledge the swing against.
"I look forward to continuing the strong Nationals tradition of delivering and fighting for Mallee," Dr Webster said.
"I look forward to delivering the election promises made over the last month, and continuing what I've started in terms of listening to people."
Dr Webster, of Mildura, is the founder of Zoe Support, a not-for-profit assisting young mothers through pregnancy, parenting, and re-engagment with education.
She campaigned on the Nationals' record of delivering for Mallee, as well as a commitment of $1.65 million to upgrade the Wimmera River foreshore through Horsham if the Coalition was re-elected to government.
As of Sunday afternoon, the Coalition had won at least 74 seats, just shy of the 76 required to form a majority government.
Dr Webster said she was excited about the prospect of becoming one of the newest MPs in a Coalition returned to power.
"It means we can deliver more for Mallee, and that's my focus," she said.
A Nationals will remain the only party ever to represent Mallee for at least another three years, having held the seat since its creation in 1949.
Other Mallee candidates at this election, in order of ballot appearance, were Mr Petrovich, Independent Cecilia Moar, Independent Jason Modica, Fraser Anning's Conservative National Party's Rick Grosvenor, the Nationals' Anne Webster, Citizens' Electoral Council's Chris Lahy, Rise Up Australia Party's Phillip Mollison, Labor's Carole Hart, Science Party's Leigh Firman, Independent Ray Kingston, Shooters Fishers and Farmers' Dan Straub, United Australia Party's Rick Millar and the Greens' Nicole Rowan.
The National Party has held all 16 of its lower house seats at the election and added two women to its caucus.
One is Dr Webster, the other Perin Davey, who won the third NSW Senate spot.