Where Is 343 Area Code? United States Map & Time Zone

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📞 343 Area Code — Quick Reference
📍 LocationOttawa, Ontario
🕐 Time ZoneEastern (UTC-5/UTC-4)
🗓️ StatusActive — Geographic

Got a call from 343? That number originates in Ottawa, Ontario. Whether you received an unexpected call from this number or you’re trying to figure out where a 343 number is based, this guide covers the exact location, time zone, spam reputation, blocking instructions, and which cities fall under this code.

📍 Where Is the 343 Area Code Located?

The 343 area code is located in Ontario, primarily serving Ottawa and the surrounding region. It’s a standard geographic area code under the North American Numbering Plan (NANP). Keep in mind that mobile number portability means someone could carry a 343 number with them after moving — so the code tells you where the number was issued, not necessarily where the person is right now.

343 Area Code — Location Details
State/ProvinceOntario (ON)
Major CityOttawa
CountryCanada (+1)
Time ZoneEastern (UTC-5/UTC-4)
TypeGeographic — Standard
NANPA StatusActive

🕐 343 Area Code Time Zone

The 343 area code operates in the Eastern Time Zone (UTC-5/UTC-4). Here’s how it compares to other US time zones:

Time ZoneDifference from 343
Eastern TimeSame time
Central Time-1 hour
Mountain Time-2 hours
Pacific Time-3 hours
💡 Calling Tip: Reach someone in the 343 area between 10 AM – 4 PM their local time for the best chance of an answer. Calls outside those hours are more likely to be screened or ignored.

🛡️ Is 343 Area Code Spam or Scam?

Seeing 343 on your caller ID doesn’t automatically mean spam — it’s a real area code used by many in Ottawa. But robocallers frequently disguise their actual numbers behind familiar area codes like 343. If a 343 call feels off, hang up and verify independently.

⚠️ Red Flag: If a 343 caller demands immediate payment via gift cards, wire transfer, or crypto — hang up. No legitimate organization uses these methods. Verify by calling the company’s official number directly.

How to verify: Don’t call back the number — look up the official number for whatever organization the caller claimed to represent and call that instead. Google the full 10-digit number in quotes to check if others have reported it as spam.

📵 How to Block 343 Spam Calls & Texts

Block on iPhone

  1. Open Phone → tap Recents
  2. Tap ⓘ next to the 343 spam number
  3. Scroll down → “Block this Caller”
  4. Silence all unknowns: Settings → Phone → Silence Unknown Callers → ON

Block on Android

  1. Open Phone → find the 343 number
  2. Tap ⋮ menu → “Block number”
  3. For broader blocking: Settings → Blocked numbers → Unknown toggle ON

Report Spam

  1. Forward spam texts to 7726 (SPAM)
  2. Report at reportfraud.ftc.gov
  3. Register at donotcall.gov or call 1-888-382-1222

🔍 Who Called from 343? Reverse Lookup

  1. Google the full 10-digit number in quotes — catches ~70% of unknown callers
  2. Check Whitepages.com or Truecaller.com
  3. Search 800notes.com for community reports
  4. No voicemail left? Almost certainly spam — legitimate callers leave messages
⚠️ One-Ring Scam: If a 343 number rings once and hangs up, do NOT call back. This scam connects you to a premium-rate line that charges your bill.

🔗 Nearby Area Codes

CodeLocationTime Zone
437Toronto, OntarioEastern
647Toronto, OntarioEastern
416Toronto, OntarioEastern
613Ottawa, OntarioEastern
365Hamilton, OntarioEastern

❓ 343 Area Code — FAQ

What state is 343 area code in?
The 343 area code is in Ontario, serving Ottawa and surrounding areas.
What city does 343 cover?
343 primarily covers Ottawa and nearby communities in Ontario.
Is 343 toll-free?
No. 343 is a geographic area code. Toll-free codes are 800, 833, 844, 855, 866, 877, 888.
What time zone is 343?
Eastern (UTC-5/UTC-4).
Is 343 a scam?
343 is legitimate — it serves real people in Ottawa. But scammers may spoof 343 numbers. Verify suspicious callers independently.
Why do I keep getting 343 calls?
Repeated 343 calls without a known contact are likely robocalls. Use your phone’s Silence Unknown Callers feature.
Can I get a 343 number remotely?
Yes — VoIP services like Google Voice offer 343 numbers regardless of where you live.
Is 343 cell or landline?
343 covers both. US area codes don’t distinguish between mobile and landline.
How do I block 343 calls?
iPhone: Settings → Phone → Silence Unknown Callers. Android: Phone → Settings → Blocked numbers. For area-code blocking, use Truecaller or RoboKiller.

🔗 Related Area Code Guides

Updated April 2026 · Data from NANPA & FCC · areacodess.org/