Ottawa, Ontario
343 Area Code
Build a credible local presence in Ottawa and Eastern Ontario with a 343 area code number. Trusted by businesses that want higher pickup rates and stronger recognition across Canada's National Capital Region.
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About 343 Area Code
Area code 343 covers Ottawa, Canada's national capital, and a wide stretch of Eastern Ontario. It launched on May 17, 2010, as an overlay to the original 613 area code, which had been serving the region since 1947. As device proliferation pushed 613 toward exhaustion, the Canadian Radio-television and Telecommunications Commission (CRTC) approved 343 to bring additional numbering capacity without forcing existing subscribers to change their numbers. A third overlay, area code 753, was later added on March 26, 2022, to further extend capacity for the same geography. Together, 343, 613, and 753 serve Ottawa, Kingston, Cornwall, Brockville, Pembroke, and dozens of smaller communities across Eastern Ontario's counties.
Ottawa's economy is driven by four major pillars: the federal government, technology and telecommunications, healthcare, and education. The federal public service employs a large share of the region's workforce, while over 1,750 knowledge-based companies collectively anchor one of Canada's most recognized tech corridors. Ottawa hosts roughly 90 percent of Canada's industrial telecommunications research and development, with major players like Nokia, Ericsson, and Shopify maintaining a significant presence. Businesses in the 343 region use local numbers for government contracting outreach, IT services client support, healthcare appointment management, and conference coordination. A local 343 number signals that your organization is rooted in the National Capital Region, which builds immediate trust with government procurement officers, public sector partners, and Ottawa-area consumers alike.
FoneSwift lists live 343 number inventory with per-number capability flags on this page. Search to see which numbers support Voice, SMS, or both. Because 343 is an overlay, numbers in this area code cover exactly the same geography as 613 and 753. If a specific 343 number is not available at checkout, a 613 number provides the same local signal for Eastern Ontario audiences. For business SMS campaigns targeting Canadian recipients, note that new Canadian 10-digit numbers purchased after March 26, 2025, require A2P registration before sending messages; numbers purchased before that date used for Canada-only messaging are unaffected for now. Always verify the current CASL consent requirements before launching any outbound SMS campaign.
If your business targets Ottawa or Eastern Ontario, display your number in both local format, (343) 555-1234, and international E.164 format, +1 343 555 1234, so it renders correctly for bilingual (English and French) audiences and international partners. Government contractors and technology vendors in particular benefit from a recognizable local code because procurement contacts are more likely to answer a familiar area code. Start a free trial on FoneSwift, pick your 343 number, and route it to an AI receptionist, IVR, or call queue in minutes. For number porting, our porting guide walks through the process, and most geographic ports complete within five to ten business days.
10-digit dialing is mandatory throughout the 343 region due to the 613/343/753 overlay. For business SMS, Canadian 10-digit numbers purchased on or after March 26, 2025, require A2P registration for messaging to Canadian recipients. Numbers texting U.S. recipients require A2P registration regardless of purchase date. CASL governs commercial messaging consent in Canada.
Area code 343 uses Eastern Time: Eastern Standard Time (EST, UTC-5) from the first Sunday in November to the second Sunday in March, and Eastern Daylight Time (EDT, UTC-4) for the remainder of the year. Ontario observes Daylight Saving Time. Standard business hours in Ottawa are 9 AM to 5 PM local time.
Because 343 is an overlay of 613, both codes carry equal local credibility in Ottawa and Eastern Ontario. If 343 inventory is limited, a 613 number delivers the same regional trust signal. For bilingual markets, consider routing calls through an IVR that offers English and French options, as Ottawa has a significant Francophone population.
Quick Facts about 343 Area Code
Interesting tidbits about this area code 343
Overlay of a 1947 original
343 was created to relieve pressure on area code 613, one of Canada's original area codes assigned all the way back in 1947. The overlay approach let existing 613 subscribers keep their numbers while new capacity opened up.
Canada's telecom R&D capital
Ottawa is home to roughly 90 percent of Canada's industrial telecommunications research and development. Nokia, Ericsson, and Ciena all operate major engineering labs in the region, making 343 a code closely tied to the global telecom industry.
Third overlay added in 2022
Demand for Eastern Ontario numbers grew fast enough to warrant yet another overlay. Area code 753 was added on March 26, 2022, making Ottawa one of the few Canadian metros served by three active area codes at the same time.
Bilingual capital
Ottawa borders Gatineau, Quebec, giving the region a large bilingual French-English population. Businesses in the 343 area often run customer support lines in both languages, making bilingual IVR and voice routing a practical need rather than a nice-to-have.
Shopify's hometown code
Shopify, one of the world's largest e-commerce platforms, was founded in Ottawa and still maintains a major presence in the city. The 343 area code is literally the home code for one of Canada's most recognized global tech success stories.
10-digit dialing is mandatory
Because 343, 613, and 753 all serve the same geography, callers in the Ottawa region must dial all 10 digits for every local call. Dialing just seven digits will not connect.
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How Does Local 343 Phone Numbers Work?
A local business number is a structured telephone identifier that tells networks where to route calls and messages. When you use a 343 number in Ottawa and Ontario, the digits signal the international gateway, the geographic region, the local exchange and the specific subscriber, so calls reach the right destination quickly and reliably.
The typical parts of a Canada local number are:
- Country code (+1): identifies Canada for international routing.
- Area code (343): directs the call to the Ottawa / Ontario region.
- Central office / exchange (eg. 555): narrows the call to a local switching area or rate center.
- Subscriber number (eg. 1234): the unique line assigned to a person, extension, or device.
Example formats:
| International Format (E.164) | +1 343 555 1234 |
| Local Format (National) | (343) 555-1234 |
Quick Dialing Guide
The correct formats to reach 343 numbers locally and globally.
From Landlines
Standard Canada FormatUse for domestic long-distance calls within Canada.
From Mobile
E.164 InternationalThe universal format. Works on any mobile device, anywhere.
International
From abroadDialing from outside Canada (exit code 00 varies by country).
With FoneSwift, your 343 number can be instantly configured through our intuitive dashboard. Connect it to call forwarding rules, AI voice agents, IVR menus, or route calls directly to any device. Enable voice, SMS, and MMS capabilities right from your account, no technical setup required. Your number becomes active immediately after purchase, and you can update routing, business hours, and integrations anytime.
For businesses, local numbers offer clear benefits: higher answer rates, stronger local recognition, and better performance for local campaigns and customer trust. Typical business features include call forwarding, call recording, auto-attendants, voicemail-to-email, and multi-device ringing.
Important operational notes:
- SMS & A2P: If you plan to send application-to-person messages from a 343 number, register your traffic where required and follow carrier rules (10DLC/A2P) to avoid deliverability or throughput issues.
- Number Porting: Bring your existing 343number to FoneSwift seamlessly. Our team handles the entire porting process, simply submit your number details and we'll coordinate with your current provider. Porting typically completes within 5-10 business days, and you'll receive updates at each step. There's no service interruption during the transfer.
- Display & formatting: Always publish numbers in both local and E.164 formats so international and mobile users can easily dial.
Ready to get started? Browse available 343 numbers in the phone numbers section above, you'll see real-time availability and can filter by features like voice, SMS, and MMS. Once you find your perfect number, purchase it in seconds and start making calls immediately. Our team is here to help you choose the right setup for your business needs, whether you're setting up AI receptionists, call forwarding, or SMS campaigns. Start your 14-day free trial today, no credit card required.
How to Get a 343 Phone Number
Buying a local 343 phone number using FoneSwift is easy and takes just a few minutes. Follow these simple steps to get your local 343 phone number and start connecting with customers in Canada today.
Create a new account on FoneSwift or sign in to your existing account to get started.
Once logged in, you'll be taken to your FoneSwift dashboard where you can manage all your phone numbers and settings.
Click on Settings in the sidebar, then go to "My Numbers" and click the "Add a Number" button.
Choose Canada as your country from the dropdown menu.
Select Local as the type of number, then choose the 343 area code from the available options.
Click the "Search" button to see all available phone numbers with the selected area code.
Browse through the available numbers, select one that fits your needs, click "Buy Number", and confirm your purchase.
Your number is now active! Start making and receiving calls from the FoneSwift Dialer immediately.
You can configure your number to handle calls, forward calls, or even create an AI voice agent to handle the calls for you.
Businesses Using 343 Phone Numbers
Ottawa and Eastern Ontario are anchored by the federal government, a thriving tech sector, healthcare institutions, and professional services firms. Local 343 phone numbers are widely used for client-facing operations, government outreach, and regional campaigns where a local presence matters.
Government contractors and public sector vendors
Federal procurement contacts and public service teams respond better to familiar local numbers. A 343 number signals that your firm is operating within the National Capital Region and is accustomed to working with Canadian government clients.
Technology and software companies
Ottawa's tech corridor hosts over 1,750 knowledge-based companies. Local numbers are commonly used for client support lines, sales outreach, and product demo scheduling, especially for companies serving both government and enterprise customers.
Healthcare and life sciences
Major hospitals, research institutions, and clinical practices across Eastern Ontario use local numbers for appointment reminders, patient callbacks, and telehealth coordination. A recognizable local code improves answer rates for outbound patient communications.
Tourism, hospitality and events
Ottawa draws visitors year-round for Parliament Hill tours, Winterlude, and the Canadian Tulip Festival. Hotels, tour operators, and event venues rely on local numbers for reservations and visitor inquiries, where a local area code builds immediate credibility.
Education and research institutions
The University of Ottawa, Carleton University, and numerous federal research labs generate consistent local telephony demand for admissions, alumni relations, and research collaboration. Local numbers increase trust among prospective students and academic partners.
Legal, consulting and financial services
Law firms, management consultancies, and financial advisors serving government and corporate clients in Ottawa use local numbers to reinforce their regional presence and ensure clients associate them directly with the National Capital Region.
Why Choose 343 Local Phone Number for Your Business?
Discover the advantages of having a local phone number that builds trust, increases engagement, and drives results.
Powerful Features for Your 343 Local Phone Number
Get the most out of your localphone number with FoneSwift's enterprise-grade features designed to help your business communicate more effectively.
Nearby Area Codes
Explore other area codes in the same region to expand your local presence.
Frequently Asked Questions
What cities use the 343 area code?
When was the 343 area code created?
What is the difference between 343, 613, and 753?
Can I get SMS-capable numbers in area code 343?
Do I need to register for A2P messaging when using a 343 number in Canada?
Is the 343 area code a toll-free number?
Do I need to dial 10 digits for calls within the 343 area?
How do I buy a 343 local phone number for my business?
Can I port my existing 343 or 613 number to FoneSwift?
Where can I find official information about the 343 area code?
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