<P> Area code 403 is a telephone area code in the Canadian province of Alberta, encompassing the southern third of the province, including the Calgary area . It is one of the original 89 area codes assigned in 1947 in the contiguous United States and the then nine provinces extent of Canada . </P> <P> Prior to October 21, 1997, the 403 area code encompassed the whole province of Alberta, the Yukon and the western half of the Northwest Territories, reaching more than one ninth of the circumference of the planet from the 49th Parallel to the North Pole . The territories were given their own separate area code, 867, in 1997 . On January 25, 1999, the northern two - thirds of Alberta, including Edmonton, was split into the new area code 780 . Generally, everything from Red Deer and Lacombe southward stayed in 403 . Permissive dialing of 403 continued across the province until May 18, 1999 . </P>

Where is area code 403 located in canada