Quick answer
The 343 area code serves Ottawa, Ontario in the Eastern Time (ET) (UTC-5 / UTC-4 DST). Assigned in 2010, it covers Eastern Ontario including Ottawa, Kingston, Cornwall. Overlay code: 613.
- Region
- Eastern Ontario, ON
- Time zone
- ET (UTC-5)
- Assigned
- 2010
- Population
- ~1,400,000
- Local time now
- · live
What is the area code for Ottawa?
The area code for Ottawa, Ontario is 343, with overlay code 613 sharing the same geographic footprint. The 343 area code is a North American Numbering Plan geographic code assigned in 2010, covering the Eastern Ontario region. It serves approximately 1,400,000 residents on the Eastern Time (ET) (UTC-5 / UTC-4 DST).
All Ottawa area codes
Ottawa is served by 2 area codes across the metro area. 343 is the 2010 addition; the others were added as overlays or for surrounding suburbs.
- 343 (current page) — Overlay on the same metro, assigned 2010
- 613 — Ottawa — 1947 original
Cities served by the 343 area code
The 343 area code covers 5 major cities and towns across the Eastern Ontario region (ON):
Businesses across Ottawa and surrounding cities use 343 numbers to project local presence and lift call answer rates. Industry studies of local presence dialing consistently report answer-rate gains of 20–40% over toll-free or out-of-area numbers — a caller ID that matches the recipient's region looks familiar and gets picked up.
343 area code time zone and business hours
The 343 area code is in the Eastern Time (ET) zone (UTC-5 / UTC-4 DST). Standard business hours in 343 run 9 AM to 5 PM ET.
If you're calling into 343 from a different time zone, factor in the offset. For example, an Eastern Time business calling 343 at 9 AM ET reaches Ottawa at local time — likely outside standard business hours.
History of the 343 area code
The 343 area code was introduced in 2010 when the North American Numbering Plan was first deployed. As Ottawa grew and number demand increased, overlay code 613 was added to serve the same geographic region — a common solution that avoids forcing existing subscribers to change their numbers.
- 1947 613 added to serve the same region
- 2010 343 entered service
Is the 343 area code safe? Spam and scam calls
343 is a legitimate geographic area code for Ottawa — it is not a scam code or a premium-rate prefix, and a call from a 343 number is most likely a genuine local caller. The risk is not the area code itself but a tactic called neighbor spoofing: scammers fake their caller ID so an unwanted call appears to come from your own area code, because people answer familiar numbers more readily.
If you get an unexpected 343 call, a few signals point to a likely scam — a pre-recorded message, urgent pressure to act now, a demand for payment by gift card or wire transfer, or anyone asking for passwords, Social Insurance Number, or account numbers. Let suspicious calls go to voicemail, never share personal information, and report fraud to the Canadian Anti-Fraud Centre at antifraudcentre-centreantifraude.ca. The CRTC guide on caller ID spoofing explains your rights under Canada's STIR/SHAKEN caller-ID authentication framework. A real Ottawa business will leave a clear voicemail and will not pressure you.
US carriers verify caller ID with the STIR/SHAKEN framework, which flags many spoofed numbers as "Spam Likely" before they ring. DialPhone 343 numbers are registered for STIR/SHAKEN attestation, so calls from your business are verified as genuine and reach customers without a false spam label. See the DialPhone guide to VoIP security for more.
Why get a 343 area code number for your business?
Getting a 343 number gives your business three measurable advantages over a toll-free or out-of-area number:
- Local trust signal. Customers in Ottawa recognize 343 as their home area code. Caller ID matching builds immediate credibility for service businesses, sales outreach, and patient communication.
- Higher answer rate. Calls from a familiar local area code are answered far more often than unknown or toll-free numbers — industry measurements of local presence dialing put the lift at 20–40%, which matters most for outbound sales, appointment confirmations, and time-sensitive service callbacks.
- Targeted marketing. Businesses serving Ottawa and the broader Eastern Ontario can advertise a local number across print, radio, billboards, and digital channels for higher conversion than a national 800 number.
For businesses in Ottawa and surrounding cities, top industries that benefit from local 343 presence include Professional Services, Healthcare, and Retail. DialPhone's AI receptionist is available for every 343 number — never miss a call, even after standard business hours.
How to get a 343 area code number
Setting up a 343 business number with DialPhone takes under 10 minutes:
- Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
- Search available 343 numbers. Filter the DialPhone number inventory by area code, city, or pattern.
- Choose your number and configure. Assign your new 343 number to a user or team, set up call routing, voicemail, AI receptionist, and business SMS.
- Port your existing number (optional). Already have a 343 number? Free number porting in 2 to 5 business days with zero service interruption.
New to local numbers? The complete guide to getting a local phone number covers choosing the right area code, porting an existing line, and avoiding spam flags.
343 area code overlay codes
The Eastern Ontario region is served by multiple overlay area codes:
| Area Code | Coverage |
|---|---|
| 343 | Primary area code for Eastern Ontario, assigned 2010 |
| 613 | Overlay — same geography (assigned 1947) |
All overlay codes serve the same Ottawa region. New subscribers may be assigned any available code; existing numbers retain their original prefix.
AI receptionist for 343 area code businesses
Every DialPhone 343 number includes optional AI receptionist coverage, available 24/7. The AI handles calls when your team is unavailable — answering common questions, booking appointments, routing urgent callers to on-call staff, and capturing voicemail with full transcription and intent tagging.
For businesses in Ottawa that handle high call volume, run extended hours, or need bilingual support (especially valuable in service areas with diverse customer bases), the AI receptionist reduces voicemail backlog and improves first-call resolution.
All area codes in Ontario
Ontario has 11 active geographic area codes. The 343 area code is part of the same numbering plan as the codes listed below — calls between them are typically local within the state, depending on the carrier.
Nearby area codes
Related area codes in Ontario and the Eastern Time (ET) region:
- 416 area code — Toronto, Ontario
- 647 area code — Toronto, Ontario
- 437 area code — Toronto, Ontario
- 905 area code — Mississauga, Ontario
- 289 area code — Mississauga, Ontario
- 365 area code — Mississauga, Ontario
All Ontario area codes → · Browse all US area codes →
More area codes: ← 341 Oakland · 346 Houston →
How We Tested
DialPhone re-verifies every area code page every 90 days. Area code geography, timezone, and overlay data come from the official North American Numbering Plan Administration (NANPA) database. Pricing reflects the published DialPhone plan tiers — see the pricing page for current details. Number availability varies; check the DialPhone signup flow for live inventory in the 343 region.
What We Don't Like
- Number availability is finite. Popular Ottawa area codes can be inventory-constrained — request specific vanity patterns early.
- Porting timing varies. Most 343 ports complete in 2-5 business days; complex multi-line legacy contracts can take 7-10.
- HIPAA tier required for healthcare. The Core $24 plan doesn't include a BAA — healthcare users need Advanced ($34) or above.