Area Code 343 — Ottawa, Ontario

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About Area Code 343

Region Code
343
City
Ottawa
State
Ontario
Population
1,886,000
Largest City
Ottawa
Neighboring Codes
Time Zone
Eastern Time

Map of Area Code 343

Available Phone Numbers

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History & Cultural Notes

Serving Ottawa and much of eastern Ontario, area code 343 was introduced as an overlay to legacy 613 on May 22, 2010, bringing mandatory 10‑digit dialing to the region. Numbering relief planning later added 753 in 2022. The overlay spans communities from Kingston and Belleville to Cornwall, Brockville, and the Ottawa Valley, preserving existing numbers while expanding capacity.

As the national capital, Ottawa’s telephony footprint reflects a bilingual (English–French) workforce and heavy federal presence, alongside a prominent technology cluster centered in Kanata that earned the moniker “Silicon Valley North.” Cross‑river integration with Gatineau links Ontario’s 613/343 complex with Quebec’s 819/873, and seasonal festivals like Winterlude and the Canadian Tulip Festival underscore a strong civic identity. Heritage infrastructure such as the Rideau Canal, a UNESCO site, and major universities contribute to research intensity and stable demand from government, defense, and knowledge‑based employers.

  • Federal government, public administration, and national institutions
  • Information and communications technology (software, telecom, photonics)
  • Defense, aerospace, and security contractors
  • Higher education and research (uOttawa, Carleton, affiliated labs)
  • Tourism, cultural attractions, and convention services