Gretton is a village in Northamptonshire, England.
It is situated within the NN17 postcode district, which is within the Corby post town.
The full list of postcode districts within the Corby post town is as follows:
The Corby post town is within the Northampton postcode area.
Administrative Ward: Weldon and Gretton
Administrative District: Corby
Administrative County: Northamptonshire
Country: England
UK Parliament: Corby
NHS Local Health Authority: East Midlands
NHS Region: North, Midlands and the East