Merston is a village in West Sussex, England.
It is situated within the PO20 postcode district, which is within the Chichester post town.
The full list of postcode districts within the Chichester post town is as follows:
The Chichester post town is within the Portsmouth postcode area.
Administrative Ward: North Mundham
Administrative District: Chichester
Administrative County: West Sussex
Country: England
UK Parliament: Chichester
NHS Local Health Authority: South East Coast
NHS Region: Southern