Hartley is a village in Kent, England.
It is situated within the DA3 postcode district, which is within the Longfield post town.
DA3 is the only postcode district within the Longfield post town.
The Longfield post town is within the Dartford postcode area.
Administrative Ward: Hartley and Hodsoll Street
Administrative District: Sevenoaks
Administrative County: Kent
Country: England
UK Parliament: Dartford
NHS Local Health Authority: South East Coast
NHS Region: Southern