Long Marston is a village in Hertfordshire, England.

It is situated within the HP23 postcode district, which is within the Tring post town.

HP23 is the only postcode district within the Tring post town.

The Tring post town is within the Hemel Hempstead postcode area.

Key data for Long Marston, Hertfordshire:

Administrative Ward: Tring West and Rural

Administrative District: Dacorum

Administrative County: Hertfordshire

Country: England

UK Parliament: South West Hertfordshire

NHS Local Health Authority: East of England

NHS Region: North, Midlands and the East

A map showing the location of Long Marston, Hertfordshire within the HP23 postcode district