Municipal government of Toronto
On January 1, 1967, several of the smaller municipalities were amalgamated with larger ones, reducing their number to six. Forest Hill and Swansea became part of Toronto; Long Branch, Mimico, and New Toronto joined Etobicoke; Weston merged with York; and Leaside amalgamated with East York. This arrangement lasted until 1998, when the regional level of government was abolished and Etobicoke, North York, East York, York, and Scarborough were amalgamated into Toronto the "megacity". Mel Lastman, the long-time mayor of North York before the amalgamation, was the first mayor (62nd overall) of the new "megacity" of Toronto, which is the successor of the previous City of Toronto.
York Mills
In 1953, York Mills, along with North York, was severed from York County, joining other municipalities to form the regional government of Metropolitan Toronto. The area was the site of a tragic accident on March 17, 1960, when five Italian construction workers on a water main project were killed in a tunnel fire. North York later became a borough, and then a city, and was merged with five other municipalities and a regional government to form the new "City of Toronto" in 1998.