Oxford electoral district was based on Oxford County, west of what is now Toronto and inland from Lake Erie, on the Ontario Peninsula.

[1] However, the Union Act provided that the pre-existing electoral boundaries of Upper Canada would continue to be used in the new Parliament, unless altered by the Union Act itself.

[2] Oxford County had been an electoral district in the Legislative Assembly of Upper Canada.

Those boundaries had originally been set by a statute of Upper Canada in 1798: That the townships of Burford, Norwich, Dereham, Oxford upon the Thames, Blandford and Blenheim, do constitute and form the County of Oxford.

This article incorporates text from this source, which is in the public domain: An act for the better division of this province, SUC 1798, c. 5, s. 35.