Regional Municipality of Hamilton-Wentworth, Ontario

The Regional Municipality of Hamilton–Wentworth was proclaimed by the Progressive Conservative government of Ontario on January 1, 1974 (with legislation being passed the previous year). In 2001 the regional municipality was merged to form the city of Hamilton.

Regional municipalities were an experiment in two-tier municipalities created from the late 1960s to the mid-1970s. They existed mainly in the Golden Horseshoe of southern Ontario, but also in the Regional Municipality of Sudbury in northern Ontario and the Regional Municipality of Ottawa-Carleton in eastern Ontario. It proved somewhat controversial and the Regional Municipality of Hamilton–Wentworth was one of the last created by this process. Almost from its creation, some sort of merger was advocated, with "Wentworth" among the candidates for the new megacity.

The Regional Municipality of Hamilton–Wentworth upper-tier municipality comprised the bulk of the former Wentworth County which it replaced. Its lower-tier municipalities were, in order of population, the city of Hamilton, the town (later city) of Stoney Creek, the town of Ancaster, the town of Flamborough, the town of Dundas and the township of Glanbrook.

The region provided police services, public transit and social services, while the lower-tier provided fire services and recreation services. Both shared responsibility for roads and water. It was governed by a regional chair who presided over a regional council with representatives of each of Hamilton's wards and two each from other constituent municipalities. Near the end of its existence, the regional chair was chosen by direct election.

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