East York
In 1998, East York, along with North York, York, Scarborough, Etobicoke and Old Toronto, were amalgamated into the new "megacity" of Toronto. East York's last mayor was Michael Prue who went on to become city councillor for East York, and then a Member of Provincial Parliament for Beaches—East York in 2001. Between 2002 and 2005, the East York Civic Centre's "True Davidson Council Chamber" was used to hold the Toronto Computer Leasing Inquiry/Toronto External Contracts Inquiry.
Milliken, Ontario
In 1954, the area south of Steeles Avenue was severed from York County, forming the Municipality of Metropolitan Toronto. As the community was situated along Steeles Avenue, it was split between the two county/regional governments. The southern portion of the community, Milliken, became a part of Metropolitan Toronto, whereas the northern portion of the community, Milliken Mills, remained with York County (reorganized into the Regional Municipality of York in 1971).