Weymouth is a seaside town and civil parish in the Dorset district, in the ceremonial county of Dorset, England. Situated on a sheltered bay at the mouth of the River Wey, 7 miles (11 km) south of the county town of Dorchester, Weymouth had a population of 53,416 in 2021. It is the third-largest settlement in Dorset after Bournemouth and Poole.