Portesham is a village in Dorset, England.
It is situated within the DT3 postcode district, which is within the Weymouth post town.
The full list of postcode districts within the Weymouth post town is as follows:
The Weymouth post town is within the Dorchester postcode area.
Administrative Ward: Chesil Bank
Administrative District: West Dorset
Administrative County: Dorset
Country: England
UK Parliament: West Dorset
NHS Local Health Authority: South West
NHS Region: Southern