Ilmer is a village in Buckinghamshire, England.
It is situated within the HP27 postcode district, which is within the Princes Risborough post town.
The full list of postcode districts within the Princes Risborough post town is as follows:
The Princes Risborough post town is within the Hemel Hempstead postcode area.
Administrative Ward: Icknield
Administrative District: Wycombe
Administrative County: Buckinghamshire
Country: England
UK Parliament: Buckingham
NHS Local Health Authority: South Central
NHS Region: Southern