Chadwell St Mary is a village in Essex, England.
It is situated within the RM16 postcode district, which is within the Grays post town.
The full list of postcode districts within the Grays post town is as follows:
The Grays post town is within the Romford postcode area.
Administrative Ward: Chadwell St Mary
Administrative District: Thurrock
Country: England
UK Parliament: Thurrock
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East