Mexborough is a town in the City of Doncaster in South Yorkshire, England. Situated between Manvers and Denaby Main, it lies on the River Don close to where it joins the River Dearne, and the A6023 road runs through the town. It is contiguous with the town of Swinton which is directly to the southwest immediately across the railway and Conisbrough to the east. Historically part of the West Riding of Yorkshire, Mexborough has a population of 14,750, increasing to a ward population of 15,244 at the 2011 Census.