Labour's Sean Woodcock has won the seat in Banbury as Conservatives' Victoria Prentis loses her seat, coming second.
Mr Woodcock won 18,468 seats, while the former Attorney General lost her seat with 15,212 votes.
Reform UK's Paul Topley came third with 6,284 votes.
In the 2019 General Election Victoria Prentis held her seat with a majority of 16,813 on a turnout of 69.8 per cent.
The turnout this year was lower than the last general election at 66.04 per cent.
READ MORE: General Election: Reform UK surge in Oxfordshire to no avail
Banbury has had a long-standing tradition of voting Conservative since the First World War, and the Conservatives have faced a total wipe-out across Oxfordshire this General Election.
In a speech following the announcement of the results, Ms Prentis said: "I would firstly like to congratulate Sean and indeed the wider Labour new government on their success tonight.
"It's in all our interests that they succeed in their endeavours.
"It has been an enormous honour to represent Banbury for the last nine years, I won't be going anywhere and I will remain as committed to the area and to the Horton General Hospital as I have been all my life."
In his winning speech, Mr Woodcock said: "Banbury is my home, and to be elected to represent you in parliament is the highest honour I could ask for."
Reacting to the results, Mr Woodcock told the Oxford Mail: “I’m delighted obviously, I’m really pleased and privileged to be a member of parliament for the area I grew up in and live. It’s the greatest honour of my life.
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“I’m going to work as hard as I can for each and every one of you, whether you voted for me or not, this changed Labour party is absolutely focused on fixing the problems facing Britain and I am fully committed to that in Banbury.”
What can I say other than "thank you". https://t.co/ssdUUn584o
— Sean Woodcock (@SEANLWOODCOCK) July 5, 2024
The full results for Banbury are as follows:
Sean Woodcock (Labour) – 18,468
Victoria Prentis (Conservatives) – 15,212
Paul Topley (Reform UK) – 6,284
Liz Adams (Liberal Democrats) – 4,352
Arron Baker (Green) – 2,615
Cassi Bellingham (Independent) – 850
Chris Nevile (Climate Party) – 242
Declan Soper (Social Democratic Party) – 155
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