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This "exchange code protection" made it possible in some low or moderate-density areas to use seven digits to reach areas in another area code (such as Hull from Ottawa before 2006, as every Ottawa-Hull local number originally was reserved in both 613 and 819).
Also served by area code 613 and Bell Canada is Saint Regis, Quebec, a native reservation bordering Fort Covington, New York which straddles the Ontario-Québec-New York border.