Mountnessing is a village in Essex, England.
It is situated within the CM15 postcode district, which is within the Brentwood post town.
The full list of postcode districts within the Brentwood post town is as follows:
The Brentwood post town is within the Chelmsford postcode area.
Administrative Ward: Ingatestone, Fryerning and Mountnessing
Administrative District: Brentwood
Administrative County: Essex
Country: England
UK Parliament: Brentwood and Ongar
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East