Communities including Kimba, Cowell and Oak Valley will be a part of the Flinders from 2022 as part of the finalised border changes for South Australia's electorate districts.
The Electoral Districts Boundaries Commission released its final redistribution report which details electoral district boundaries for the next election cycle.
For Flinders it will gain the Kimba and Franklin Harbour district councils as well as Maralinga-Tjatjura from the Giles electorate.
Member for Flinders Peter Treloar said Kimba and Franklin Harbour had been in and out of Flinders over many years and had been getting to know Maralinga-Tjatjura, which includes the community of Oak Valley.
"I had the opportunity to visit Oak Valley just three weeks ago with the premier, it was only my second time visiting Oak Valley," he said.
"I'm getting to know that community while Kimba and Franklin Harbour I know very well.
"I think fundamentally Flinders remains an Eyre Peninsula seat...Franklin Harbour and Kimba are well and truly a part of the EP."
Mr Treloar said the change in the boundary was due to a decrease in electors within Flinders, which was one of four in the district that fell outside the plus or minus 10 per cent change tolerance.
Since the last election Flinders had seen a 11.8 per cent decrease in electors.
"The boundaries commission, in addressing the declining population in regional districts, has met the mandatory requirements of the Constitution Act to ensure that all districts comprise a number of electors within 10 per cent of the electoral quota," commission secretary David Gully said.
Changes have been made to nearly all of the state's 47 electoral districts, with Adelaide and Mount Gambier not changing, resulting in about 222,000 electors changing electoral district.
Mr Treloar is in lockdown in Adelaide as he was there for parliament and for the sitting of the Estimates Committee.