Ontario
(343) Area Code 343 — Ottawa, Ontario
343 Area Code – Ottawa, Ontario: Location, Time Zone & History
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Map of Area Code 343
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History & Cultural Notes
Government is the defining industry of the Ottawa region, and it shows in how the local numbering plan has evolved. Area code 613 has long served Ottawa and Eastern Ontario, but as demand for new lines grew, an overlay code, 343, was activated on May 17, 2010, covering the same territory without requiring anyone to change their existing 613 number.
Growth in the region continued to outpace the original overlay. A second overlay, 753, was activated in 2022 across the same 613/343 footprint, and a further code, 871, has been reserved for future use as the complex expands. Beyond Ottawa, the national capital and largest employer hub for the federal government, the 613/343 numbering plan area extends to Kingston, Belleville, Brockville, Cornwall, and Pembroke.
Alongside its role as the seat of Canada's federal government, the region supports technology, tourism, education, and defense industries, giving the 613/343/753 complex an economic base that extends well past public administration.