Willen is a village in Buckinghamshire, England.
It is situated within the MK15 postcode district, which is within the Milton Keynes post town.
The full list of postcode districts within the Milton Keynes post town is as follows:
The Milton Keynes post town is within the Milton Keynes postcode area.
Administrative Ward: Linford South
Administrative District: Milton Keynes
Country: England
UK Parliament: Milton Keynes North
NHS Local Health Authority: South Central
NHS Region: Southern