Warrington South is a constituency[n 1] represented in the House of Commons of the UK Parliament by Sarah Hall from the Labour and Co-operative Party since 2024.

Workless claimants who were registered jobseekers, were in November 2012 lower than the national average of 3.8%, at 3.3% of the population based on a statistical compilation by The Guardian.

1983–1997: The Borough of Warrington wards of Appleton and Stretton, Booths Hill, Grappenhall and Thelwall, Great Sankey North, Great Sankey South, Heatley, Latchford, Lymm, Penketh and Cuerdley, Statham, Stockton Heath, and Walton and Westy, and the Borough of Halton wards of Daresbury and Norton.

2010–2024: The Borough of Warrington wards of Appleton, Bewsey and Whitecross, Grappenhall and Thelwall, Great Sankey North, Great Sankey South, Hatton, Stretton and Walton, Latchford East, Latchford West, Lymm, Penketh and Cuerdley, Stockton Heath, and Whittle Hall.

2024–present: The Borough of Warrington wards of Appleton, Bewsey & Whitecross, Chapelford & Old Hall, Grappenhall, Great Sankey North & Whittle Hall, Great Sankey South, Latchford East, Latchford West, Lymm North & Thelwall (polling districts SNC, SND, SNE and SNF1), Penketh & Cuerdley, and Stockton Heath.

The constituency was reduced in size to bring the electorate within the permitted range by transferring the village of Lymm (but not Thelwall) to Tatton.

On election day the Liberal Democrat party held 22 of the 30 Borough Council seats in the wards which made up the constituency.

In 2015 and 2017, the seat was considered an important Labour-Conservative marginal, the Liberal Democrats losing substantial ground here in both elections.