Irnham is a village in Lincolnshire, England.
It is situated within the NG33 postcode district, which is within the Grantham post town.
The full list of postcode districts within the Grantham post town is as follows:
The Grantham post town is within the Nottingham postcode area.
Administrative Ward: Glen Eden
Administrative District: South Kesteven
Administrative County: Lincolnshire
Country: England
UK Parliament: Grantham and Stamford
NHS Local Health Authority: East Midlands
NHS Region: North, Midlands and the East