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 (valley) of the River Roch, 5 miles (8 km) north-west of Oldham and 10 miles (16 km) north-east of Manchester.