341 Area Code — California
341 is a North American Numbering Plan area code for California, the United States. It covers about 1,684,391 people in 22 towns and 79 ZIP codes, including Oakland, Fremont and Hayward.
| Field | Value |
|---|---|
| Area code | 341 |
| Country | United States (+1) |
| State / province | California |
| Type | Shares its towns with 510 |
| Time zone | Pacific |
| Population covered | 1,684,391 |
| Towns covered | 22 |
| ZIP codes | 79 |
| Approx. centre | 37.804, -122.210 |
Where area code 341 is used
Area code 341 is assigned to California, the United States, inside the North American Numbering Plan. Numbers in the code are written (341) NXX-XXXX at home and +1 341 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: 510. 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 341
The 22 towns below are the largest in the 341 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 |
|---|---|---|---|
| Oakland | Alameda County | 426,581 | 26 |
| Fremont | Alameda County | 228,297 | 5 |
| Hayward | Alameda County | 191,800 | 7 |
| Berkeley | Alameda County | 127,395 | 11 |
| San Leandro | Alameda County | 108,103 | 3 |
| Richmond | Contra Costa County | 93,152 | 7 |
| Alameda | Alameda County | 77,238 | 2 |
| Union City | Alameda County | 67,464 | 1 |
| San Pablo | Contra Costa County | 62,546 | 1 |
| Castro Valley | Alameda County | 59,361 | 2 |
| Newark | Alameda County | 46,903 | 1 |
| Emeryville | Alameda County | 34,395 | 2 |
Counties covered
| County | ZIP codes |
|---|---|
| Alameda County | 62 |
| Contra Costa County | 17 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 341
- Within North America: 341 + 7-digit number (341-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 341, then the 7-digit number — for example 00 1 341 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 341?
341 is a North American Numbering Plan area code assigned to California, the United States. It covers about 1,684,391 people in 22 towns.
Is 341 a US or Canadian area code?
341 is a United States 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 341 in?
Area code 341 is in the Pacific 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.