Rochdale is a town in Greater Manchester, England, and the administrative centre of the Metropolitan Borough of Rochdale. In the 2021 census the town had a population of 111,261, compared to 223,773 for the wider borough. Rochdale is in the foothills of the South Pennines and lies in the dale of the River Roch, 5 miles northwest of Oldham, and 10 miles northeast of Manchester.