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Ultimately, all the aforementioned places are part of the Greater Golden Horseshoe metropolitan region, an urban agglomeration, which is the fourth most populous in North America. Catharines-Niagara or Kitchener-Waterloo, are not part of the GTA or the Toronto CMA, but form their own CMAs near the GTA. Other nearby urban areas, such as Hamilton, Barrie, St.
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These different border configurations result in the GTA's population being higher than the Toronto CMA by nearly one-half million people, often leading to confusion amongst people when trying to sort out Toronto's urban population. For example, Oshawa is the centre of its own CMA, yet deemed part of the Greater Toronto Area, while other municipalities, such as New Tecumseth in southern Simcoe County and Mono Township in Dufferin County are included in the Toronto CMA but not in the GTA.
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Some municipalities considered part of the GTA are not within the Toronto Census Metropolitan Area (CMA), whose land area (5,904 km 2 in 2006) and population (5,928,040 as of the 2016 census) is thus smaller than the land area and population of the GTA planning area. See also: List of municipalities in the Greater Toronto Area The GTA continues, however, to be in official use elsewhere in the Government of Ontario, such as the Ministry of Finance. The latter includes the Greater Toronto Area's satellite municipalities, such as Peterborough, Barrie, Guelph, Kitchener, Waterloo, Cambridge and Niagara Region. In 2006, the term began to be supplanted in the field of spatial planning as provincial policy increasingly began to refer to either the "Greater Toronto and Hamilton Area" (GTHA) or the still-broader " Greater Golden Horseshoe". However, it did not come into everyday usage until the mid- to late 1990s. The use of the term involving the four regional municipalities came into formal use in the mid-1980s, after it was used in a widely discussed report on municipal governance restructuring in the region and was later made official as a provincial planning area. The term "Greater Toronto" was first used in writing as early as the 1900s, although at the time, the term only referred to the old city of Toronto and its immediate townships and villages, which became Metropolitan Toronto in 1954 and became the current city of Toronto in 1998.