Oxfordshire (formerly abbreviated Oxon) is a county in southeast England bordering on Warwickshire (to the north/northwest), Northamptonshire (to the north/northeast), Buckinghamshire (to the east), Berkshire (to the south), Wiltshire (to the southwest) and Gloucestershire (to the west).
The main centre of population is the city of Oxford. Other significant settlements are Banbury, Bicester, Kidlington and Chipping Norton to the north of Oxford; Carterton and Witney to the west; Thame and Chinnor to the east; and Abingdon, Wantage, Didcot, Wallingford and Henley on Thames to the south.
The county has major education and tourist industries and is noted for the concentration of performance motorsport companies and facilities. Oxford University Press is the largest firm among a concentration of print and publishing firms; the University of Oxford is also linked to the concentration of local biotechnology companies.
In 1974 the Vale of White Horse and parts of the South Oxfordshire administrative districts south of the River Thames, which had historically been part of Berkshire, were added to the County of Oxfordshire. At the same time, the Caversham area of Reading was transferred to Berkshire from Oxfordshire and the parish of Stokenchurch was transferred to Buckinghamshire.