Area codes 204 and 431

204431204, 431204 and 431area code 204Winnipeg204 & 431
Area codes 204 and 431 are the North American telephone area codes for the Canadian province of Manitoba, encompassing the province.wikipedia
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List of original NANP area codes

original area codesoriginal 86 area codesoriginal area code
204 is one of the original 86 area codes assigned in 1947 in the contiguous United States and the then-nine-province extent of Canada.

Flin Flon

Flin Flon, ManitobaFlin Flon, SaskatchewanChanning
For telephone service, however, they are located in Saskatchewan's area code 306 as part of the Creighton telephone exchange, rather than Manitoba's area code 204.

Winnipeg

Winnipeg, ManitobaWinnipeg, CanadaWinnipeg, MB
As in most of Canada, the number allocation problem was exacerbated by the proliferation of cell phones, particularly in and around Winnipeg.