343 Area Code — Ontario
343 is a North American Numbering Plan area code for Ontario, Canada. It covers about 0 people in 14 towns, including Clarence-Rockland, Ottawa and Carleton Place.
| Field | Value |
|---|---|
| Area code | 343 |
| Country | Canada (+1) |
| State / province | Ontario |
| Type | Shares its towns with 613 |
| Time zone | Eastern |
| Population covered | 0 |
| Towns covered | 14 |
| Approx. centre | 44.955, -76.087 |
Where area code 343 is used
Area code 343 is assigned to Ontario, Canada, inside the North American Numbering Plan. Numbers in the code are written (343) NXX-XXXX at home and +1 343 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 613. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 343
The 14 towns below are the largest in the 343 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Clarence-Rockland | — | — | |
| Ottawa | — | — | |
| Carleton Place | — | — | |
| Brockville | — | — | |
| Belleville | — | — | |
| Kingston | — | — | |
| Greater Napanee | — | — | |
| Cornwall | — | — | |
| Renfrew | — | — | |
| Pembroke | — | — | |
| Perth | — | — | |
| Gananoque | — | — |
Other area codes serving the same towns
Nearby area codes
How to dial area code 343
- Within North America: 343 + 7-digit number (343-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 343, then the 7-digit number — for example 00 1 343 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 343?
343 is a North American Numbering Plan area code assigned to Ontario, Canada. It covers about 0 people in 14 towns.
Is 343 a US or Canadian area code?
343 is a Canadian area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 343 in?
Area code 343 is in the Eastern time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.