Oxfordshire ( ; abbreviated Oxon) is a ceremonial county in South East England. The county is bordered by Northamptonshire and Warwickshire to the north, Buckinghamshire to the east, Berkshire to the south, and Wiltshire and Gloucestershire to the west. The city of Oxford is the largest settlement.
The county is largely rural, with an area of and an estimated population of in . Oxford, which is famous for its university, is near the centre of the county. Other settlements include Banbury in the north, Bicester in the north-east, Abingdon-on-Thames and Didcot in the south, and Witney in the west. For local government purposes Oxfordshire is a non-metropolitan county with five districts. The part of the county south of the River Thames, largely corresponding to the Vale of White Horse district, was historically part of Berkshire.
The lowlands in the centre of the county are crossed by the River Thames and its tributaries, the valleys of which are separated by low hills. The south contains parts of the Berkshire Downs and Chiltern Hills, and the north-west includes part of the Cotswolds; all three regions are Areas of Outstanding Natural Beauty. The county's highest point is White Horse Hill (), part of the Berkshire Downs.
Although it had some significance as an area of valuable agricultural land in the centre of the country, it was largely ignored by the Romans and did not grow in importance until the formation of a settlement at Oxford in the 8th century. Alfred the Great was born across the Thames in Wantage, in the Vale of White Horse. The University of Oxford was founded in 1096, although its collegiate structure did not develop until later on. The university in the county town of Oxford (whose name came from Anglo-Saxon Oxenaford = "ford for oxen") grew in importance during the Middle Ages and early modern period. The area was part of the Cotswolds wool trade from the 13th century, generating much wealth, particularly in the western portions of the county in the Oxfordshire Cotswolds. Morris Motors was founded in Oxford in 1912, bringing heavy industry to an otherwise agricultural county. The role of agriculture as an employer declined rapidly in the 20th century; as of 2023, 1.2 per cent of the county's population are involved in agriculture, forestry, or fishing due to high mechanisation. Nevertheless, Oxfordshire remains a very agricultural county by land use, with a lower population than neighbouring Berkshire and Buckinghamshire, which are both smaller.
During most of its history, the county was partitioned as fourteen divisions called hundreds, namely Bampton, Banbury, Binfield, Bloxham, Bullingdon, Chadlington, Dorchester, Ewelme, Langtree, Lewknor, Pyrton, Ploughley, Thame and Wootton.
The Oxfordshire and Buckinghamshire Light Infantry, the main army unit in the area, was based at Cowley Barracks on Bullingdon Green, Cowley. The Vale of White Horse district and parts of the South Oxfordshire administrative district south of the River Thames were historically part of Berkshire, but, in 1974, Abingdon, Didcot, Faringdon, Wallingford and Wantage were added to the administrative county of Oxfordshire under the Local Government Act 1972. Conversely, the Caversham area of Reading, now administratively in Berkshire, was historically part of Oxfordshire, as was the parish of Stokenchurch, now administratively in Buckinghamshire. The areas of Oxford city south of the Thames, such as Grandpont, were transferred much earlier in 1889.
The northernmost point of the county is near Claydon Hay Farm, Claydon at . This is where the Cherwell District of Oxfordshire meets the counties of Warwickshire and Northamptonshire. This northernmost area of Cherwell is within the Northamptonshire Uplands (National Character Area 80), a range of ironstone-capped limestone hills and valleys. The area within the Northamptonshire Uplands includes the market town of Banbury.
South of the Uplands are the eastern extent of the Cotswolds (NCA 107), a hill range forming part of a wider oolitic limestone range across England known for its local stone. A large part of the wider Cotswolds within the county are in the protected Costwolds National Landscape. Oxfordshire's westernmost point is in the Cotswolds NCA at , near Downs Farm, Westwell.
South of the Costwolds, Oxfordshire opens up into the undulating farmland of the upper Thames clay vales (NCA 108). The clay vales encircle the Midvale Ridge (NCA 109), a band of low-lying limestone hills running through the centre of the county. These two landscapes are the population centres of the county, containing Oxford itself as well as other key towns such as Witney, Bicester and Abingdon.
To the south west of the county, the clay vales give way to the chalk hills of the Berkshire Downs (NCA 116) south of Wantage, known particularly for the Uffington White Horse. The Downs form part of the North Wessex Downs National Landscape.
The Berkshire Downs extend to the Thames at Goring, east of which are further chalk hills in the Chiltern Hills (NCA 110), much of which is in the Chilterns National Landscape. South of the boundaries of the National Landscape are Oxfordshire's southernmost and easternmost points near the near Thames and Kennet Marina at Playhatch () and Shiplake () respectively.
Long-distance walks within the county include the Ridgeway National Trail, Macmillan Way, Oxfordshire Way and the D’Arcy Dalton Way.
Many smaller rivers in the county feed into the Thames, such as the River Thame, River Windrush, River Evenlode and River Cherwell. Some of these have trails running along their valleys. The Oxford Canal links to the Midlands and follows the Cherwell from Banbury via Kidlington into the city of Oxford, where these join the navigable Thames. About 15% of the historically named Wilts & Berks Canal, in sporadic sections, has been restored to navigability.
| +Regional gross value added at current basic prices in millions pounds sterling. |
| 5,404 |
| 7,853 |
| 10,184 |
In the 2016 European Union referendum, Oxfordshire was the only English county as a whole to vote to remain in the European Union by a significant margin, at 57.06% (70.27% in the City of Oxford), despite Cherwell (barely) voting to leave at 50.31%.
The county has two universities: the ancient University of Oxford and the modern Oxford Brookes University, which are both located in Oxford. In addition, Wroxton College, located in Banbury, is affiliated with Fairleigh Dickinson University of New Jersey.
Blenheim Palace, close to Woodstock, was designed and partly built by the architect John Vanbrugh for John Churchill, 1st Duke of Marlborough, after he had won the battle of Blenheim. The gardens, which can be visited, were designed by the landscape gardener "Capability" Brown, who planted the trees in the battle formation of the victorious army. Sir Winston Churchill was born in the palace in 1874. It is open to the public.
Chastleton House, on the Gloucestershire and Warwickshire borders, is a great country mansion built on property bought from Robert Catesby, who was one of the men involved in the Gunpowder Plot with Guy Fawkes. Stonor Park, another country mansion, has belonged to the Recusancy Stonor family for centuries.
Mapledurham House is an Elizabethan era stately home in the south-east of the county, close to Reading.
The Abbey in Sutton Courtenay is a medieval courtyard house. It has been recognised by the Historic Building Council for England (now Historic England) as a building of outstanding historic and architecture interest.The Abbey, Sutton Courtenay archives. It is considered to be a 'textbook' example of the English medieval manor house and is a Grade I-listed building.
| 1 | Oxford | 162,100 | Oxford non-metropolitan district | |
| 2 | Banbury | 54,335 | Civil parish | |
| 3 | Abingdon-on-Thames | 37,931 | Civil parish | Historic Berkshire |
| 4 | Bicester | 37,020 | Civil parish | |
| 5 | Didcot | 32,183 | Civil parish | Historic Berkshire |
| 6 | Witney | 31,217 | Civil parish | |
| 7 | Carterton | 15,680 | Civil parish | |
| 8 | Kidlington | 13,600 | Civil parish | Does not include Gosford |
| 9 | Thame | 13,273 | Civil parish | Includes Moreton. |
| 10 | Wantage | 13,106 | Civil parish | Historic Berkshire |
| 11 | Henley-on-Thames | 12,186 | Civil parish | |
| 12 | Faringdon | 8,627 | Great Faringdon civil parish | Historic Berkshire |
| 13 | Wallingford | 8,455 | Civil parish | Historic Berkshire |
| 14 | Grove | 8,336 | Civil parish | |
| 15 | Chinnor | 7,651 | Civil parish | |
| 16 | Chipping Norton | 7,250 | Civil parish | |
| 17 | Eynsham | 5,324 | Civil parish | |
| 18 | Benson | 4,801 | Civil parish | |
| 19 | Wheatley | 4,267 | Civil parish | |
| 20 | Sonning Common | 4,138 | Civil Parish | |
| 21 | Kennington | 4,133 | Civil parish | |
| 22 | Woodstock | 3,521 | Civil parish | |
| 23 | Charlbury | 3,063 | Civil parish | |
| 24 | Bampton | 2,993 | Civil parish | |
| 25 | Watlington | 2,697 | Civil parish | |
| 26 | Deddington | 2,301 | Civil parish |
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