Area code 403 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Area code 403" in English language version.

Last modified: 11:58:18, 3 August 2026 (UTC)

Ref.Un. Ref.Website

Global rank English rank

low place

6,750^th place

33nationalnanpa.com

low place

5,610^th place

22web.archive.org

1^st place

1^st place

3,368^th place

1,736^th place

low place

low place

110^th place

65^th place

11calgarysun.com

low place

6,128^th place

11abheritage.ca

low place

9,071^st place

abheritage.ca (Global: low place; English: 9,071^st place)

"Alberta Government Telephones (AGT)".

calgarysun.com (Global: low place; English: 6,128^th place)

"Alberta set to dial up new 825 area code, CRTC announces". Calgary Sun. 2013-10-30. Archived from the original on 2015-07-31. Retrieved 2015-07-30.

cbc.ca (Global: 110^th place; English: 65^th place)

"Let your fingers do the 10-digit walking". CBC News. 2008-06-23.

cnac.ca (Global: low place; English: low place)

"Canadian Geographic Area Code Relief History" (PDF). CNAC. 2023-06-30. Retrieved 2025-05-25.

crtc.gc.ca (Global: 3,368^th place; English: 1,736^th place)

"Telecom Decision CRTC 2019-130". CRTC. 2019-05-03. Retrieved 2019-05-14.
"Telecom Decision CRTC 2021-101". CRTC. 2021-03-05.

nanpa.com (Global: low place; English: 6,750^th place)

"Status of Numbering Plan Area (NPA) Codes in World Zone 1" (PDF). NANPA/Bellcore. 1993-01-13. Retrieved 2025-05-24.
"Planning Letter 46: Declaration of Jeopardy Situation in NPA 403 (Alberta)" (PDF). NANPA/Bellcore. 1997-03-12. Retrieved 2025-05-24.
"Planning Letter 84: NANP-Split of 403 (Alberta) Numbering Plan Area (NPA)" (PDF). NANPA/Bellcore. 1997-09-02. Retrieved 2025-05-24.

nationalnanpa.com (Global: low place; English: 5,610^th place)

"Planning Letter PL-364: NPA 587 to Overlay NPAs 403 and 780 (Alberta, Canada)" (PDF). NANPA. 2007-07-27.
"Planning Letter PL-369: NPA 587 to Overlay NPAs 403 and 780 (Alberta, Canada)" (PDF). NANPA. 2007-10-15.
"Planning Letter PL-374: NPA 587 to Overlay NPAs 403 and 780 (Alberta, Canada)" (PDF). NANPA. 2008-02-26.

web.archive.org (Global: 1^st place; English: 1^st place)

Canadian Numbering Administrator Website
"Alberta set to dial up new 825 area code, CRTC announces". Calgary Sun. 2013-10-30. Archived from the original on 2015-07-31. Retrieved 2015-07-30.