The Oxford County regional seat is in Woodstock. Oxford County has been a regional municipality since 2001 but has retained the word "county" in its name. It has a two-tier municipal government structure, with the lower-tier municipalities being the result of a merger in 1975 of a larger number of separate municipalities that previously existed before the restructuring. It also comprises a single Statistics Canada census division, and a single electoral division for federal and provincial elections for which the precise boundaries have been revised from time to time. For part of its history, it was divided into two ridings, Oxford North, for federal and provincial elections, and Oxford South, for federal and provincial elections, for each of which see their own pages. Oxford County had its own school board until 1998, when it was merged into the Thames Valley District School Board. It had its own Health Unit until 2018, when it was merged into the Southwestern Public Health Unit.