Historic county of England
Dorset
Dorsetshire
Chalk downs meeting a coast of Purbeck limestone, Portland stone and Chesil shingle.
Dorset occupies a remarkably varied stretch of England’s south coast. Poole Harbour anchors the east of the county; the Purbeck peninsula projects south of it; chalk country spreads around Dorchester; and Weymouth, Portland and Chesil Beach lead westwards towards the cliffs and coves around Lyme Regis. Bournemouth lies beyond Dorset in geographic Hampshire, despite its association with later Dorset-named administrative areas.
Inland, the county moves between sweeping chalk downs, clay vales, wooded western country and eastern heath. Dorchester stands close to the geographical centre of this complexity. Few counties expose their underlying structure so openly: ridge, vale, harbour, limestone peninsula, shingle barrier and cliff repeatedly reveal the geology beneath the landscape.
- Dornsǣt: “dwellers of Dorn”
- Wessex shire by the 8th century
- Domesday (1086): Dornescire
- Area: 1,005 sq miles / 2,603 km²
- Population: 543,296
- County top: Lewesdon Hill 915 ft / 279 m
County geography
Current Census
Contemporary Census profile
England and Wales Census 2021. Detailed contemporary statistics are available in the Geographic County Census Explorer.
- Population density
- 560.5 people per sq mi (216.4 people per km²)
- Population
- 563,131
A coast built from geology
Dorset’s coast is one of the clearest geological landscapes in Britain. From the chalk and limestone around Purbeck to the younger and older rocks exposed westwards, cliffs and coves display a long sequence of geological time.
The result is not merely scientifically important. Rock type directly shapes the coastline, producing headlands, landslips, arches, coves and beaches with sharply different forms.
Downs and vales
The Dorset Downs form a broad chalk backbone through much of the interior. Between and beyond the ridges lie softer clay vales, producing more enclosed farming country and a different pattern of settlement.
In the east, heath and sandy soils introduce another landscape again. Dorset’s variety comes from these rapid changes in underlying geology rather than from great differences in altitude.
Purbeck, Portland and Chesil
Purbeck and Portland give Dorset some of its hardest and most celebrated building stone. Between Portland and the western coast stretches Chesil Beach, the great shingle barrier which encloses the Fleet lagoon behind it.
Together these features form a maritime landscape quite unlike the harbours and heathlands further east.
County questions
Questions about Dorset
Is Bournemouth in Dorset?
No. Bournemouth is geographically in Hampshire. Later local-government and lieutenancy arrangements associated it with Dorset, but they did not alter the geographic county boundary.
Is the Jurassic Coast the same thing as Dorset?
No. The Jurassic Coast is a geological and heritage designation extending from Dorset into Devon. It is not a county boundary.
County record
Names and continuity
- Formal name
- County of Dorset
- Alternative name
- Dorsetshire
- County day
- 1 June
- Foundation
- c.841
Dorset, Dorsetshire and County of Dorset are forms of the same county name. The shire was established within Wessex centuries before the Norman Conquest.