Other significant settlements are Bicester , Banbury , and Chipping Norton to the north of Oxford ; Witney to the west ; Thame and Chinnor to the east ; and Abingdon , Wantage , Didcot and Henley-on-Thames to the south . Other significant settlements are Banbury , Bicester , Kidlington , and Chipping Norton to the north of Oxford ; Witney to the west ; Thame and Chinnor to the east ; and Abingdon , Wantage , Didcot , Wallingford and Henley-on-Thames to the south .