Mainsforth is a village in County Durham, England.
It is situated within the DL17 postcode district, which is within the Ferryhill post town.
The full list of postcode districts within the Ferryhill post town is as follows:
The Ferryhill post town is within the Darlington postcode area.
Administrative Ward: Sedgefield
Administrative District: County Durham
Country: England
UK Parliament: Sedgefield
NHS Local Health Authority: North East
NHS Region: North, Midlands and the East