Area code 403 Area code 403 is a telephone area code in the Canadian province of Alberta, encompassing the southern half of the province, including the Calgary area. It is one of the original 86 area codes assigned in 1947 in the contiguous United States and the then nine province extent of Canada. Prior to October 21 1997, the Area Code 403. 403 Covers 1 Province. AB, Canada. NT, Canada. 403 Covers 261 Canadian Cities. Canadian Postal Code Database Get all Canadian Postal Codes, Provinces, Cities and their information in one easy to use database. U.S. ZIP Code Database Get all US ZIP Codes and their information in one easy to use database. ZIP+4 ZIP Code Database Covering every address in the U.S., get the +4 information you need. AreaCode.org is an area code directory with helpful information on the various United States area codes, area code listing, and other area code phone details. AreaCode.org also list international area codes within the North American Numbering Plan. Find out more with area code decoder. Not looking for Calgary 403 area code information? We also have Specialized Telecom Services 600 area code information for the 600 Area Code and Calgary 587 area code information for the 587 Area Code. 403 Area Code. Area code 403 covers the southern portion of the Canadian province of Alberta, including Calgary. Area code 587 is an overlay on the entire province, including 403 and also â¦area code 780 for the northern portion, including Edmonton. What country is area code 312? North American area code +1 312 is in downtown Chicago, Illinois. International country code +31 is the Netherlands, and a number beginning with +31 2 is a landline. Share to: What country has an area code of 359? +359 is the country code for Bulgaria. Lookup any area code or prefix (NPA/NXX) in our database using our FREE Area Code Finder Below: Area Code (NPA). Prefix (NXX). City. State Abbrev. Zip Code. County. Company (Ex: Verizon). Advanced Search. Area Code History. Area Code FAQ. For more info [email protected] 1- 800-425-1169. The 403 area code belongs to the Alberta (AB) province of Canada and some of the locations covered are Calgary, Medicine Hat and more: Province. Larger cities in area code 403. Time Zone. AB Alberta. Area code 403 is a telephone area code in the Canadian province of Alberta, encompassing the southern half of the province. Prior to 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. In 1999, the northern half of Alberta was split into the new area code 780..