Helmdon is a village in Northamptonshire, England.
It is situated within the NN13 postcode district, which is within the Brackley post town.
NN13 is the only postcode district within the Brackley post town.
The Brackley post town is within the Northampton postcode area.
Administrative Ward: Astwell
Administrative District: South Northamptonshire
Administrative County: Northamptonshire
Country: England
UK Parliament: South Northamptonshire
NHS Local Health Authority: East Midlands
NHS Region: North, Midlands and the East