Hartley is a village and civil parish in the Sevenoaks district of Kent, England. It is located 7 miles south west of Gravesend and the same distance south east of Dartford. The village of Hartley is recorded as Erclei in the Domesday Book of 1086, with a population of 15 families and 3 slaves. The name Hartley means "place in the wood where the deer …Hartley is a village and civil parish in the Sevenoaks district of Kent, England. It is located 7 miles south west of Gravesend and the same distance south east of Dartford. The village of Hartley is recorded as Erclei in the Domesday Book of 1086, with a population of 15 families and 3 slaves. The name Hartley means "place in the wood where the deer are". The parish church of All Saints dates from the early 12th century, although it probably replaced an earlier Anglo-Saxon building.