800 is the natural number following 799 and preceding 801.
Area codes 705 and 249 are telephone area codes that cover most of northeastern and central Ontario in Canada. 705 was initially created in 1957 by the North American Numbering Plan (NANPA) from portions of the area covered by area codes 613 and 519, and covered nearly all of Ontario north and west of the Golden Horseshoe. Area code 807, covering northwestern Ontario, was split from area code 705 in early 1962. Although 705 was not close to exhaustion at the time, creating a new area code was thought necessary in order to improve routing of calls from Manitoba and western Canada to northwestern Ontario. Greater routing efficiency has since been achieved with the implementation of highly computerized digital exchanges that were not available in the early 1960s.
Area codes 519, 226 and 548 are the telephone area codes serving most of southwestern Ontario.
Area codes 819 and 873 are area codes for central and western Quebec, Canada, including the Quebec portion of the National Capital Region, and the Hudson Strait and Ungava Bay coastlines of Quebec. Major cities in the 819 territory include Gatineau, Sherbrooke and Trois-Rivières.
Area code 701 is an area code used to address long distance calls to, and within, the state of North Dakota, which is part of the North American Numbering Plan. It is one of the 86 original area codes created by AT&T in 1947, and continues to be the only area code in North Dakota.
Area codes 778, 236, and 672 are overlay area codes for the Canadian province of British Columbia. They overlay the existing area codes, 604 and 250, simultaneously, requiring ten-digit dialling throughout the province. The area codes also serve the United States community of Hyder, Alaska, which sits along the Canada–United States border near the town of Stewart.
Area code 506 is the telephone area code in the Canadian province of New Brunswick, encompassing the entire province. The code was created in 1955, when New Brunswick and Newfoundland split from the 902 area code; Newfoundland and Labrador split to its own 709 area code in early 1962. Besides 506 & 709, 807 & 867 are the other Canadian area codes to still use 7-digit dialling and have yet to be overlaid. The incumbent local exchange carrier in 506 is Bell Aliant, which was produced from a merger that included NBTel. Since 2005, local telephone service through Eastlink Communications has also been available in the town of Sackville. The 506 code is expected to "exhaust" in 2020. The 428 area code will overlay the 506 on November 21, 2020, and will ease the province from the burden & expense of changing numbers.
Area codes 450 and 579 are telephone area codes in the Canadian province of Quebec, encompassing the off-island suburbs of Montreal, which is served by area codes 514 and 438. Among the cities served by area code 450 are Longueuil and Laval. The communities of Ormstown, Huntingdon, Boucherville, Varennes, Roussillon, Joliette, Saint-Hyacinthe, Granby, Chambly, Saint-Jean-sur-Richelieu and Vaudreuil-Dorion are also part of this area code. The 450 area code is also shared by several small communities in an adjacent part of Ontario: some landline customers in Chute-à-Blondeau, near Pointe-Fortune have +1-450-451-xxxx numbers from the Rigaud phone exchange.
Area codes 617 and 857 are the North American area codes serving Boston and several surrounding communities in Massachusetts—such as Brookline, Cambridge, Newton and Quincy.
North American area code 802 is the state of Vermont's sole telephone area code. It was established as one of the original area codes in October 1947.
Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's area code since area codes were created in 1947.
Lingnan is a geographic area referring to the lands in the south of the Nanling Mountains. The region covers the modern Chinese provinces of Guangdong, Guangxi, and Hainan as well as modern northern Vietnam.
The chancellor was a semi-formally designated office position for a number of high-level officials at one time during the Tang dynasty. This list includes chancellors of the reign of Wu Zetian, which she referred to as the "Zhou dynasty" (周), rather than "Tang" (唐).
Area codes 587 and 825 are telephone area codes that cover all of Alberta, Canada, in addition to the incumbent codes, southern Alberta's 403 and northern Alberta's 780. Numbers in area code 587 started being allocated in late 2008. The new area codes overlay 403 and 780 simultaneously, covering the entire province, and make 10-digit dialing necessary throughout Alberta.
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