628 Area Code — California
628 is a North American Numbering Plan area code for California, the United States. It covers about 1,086,823 people in 24 towns and 89 ZIP codes, including San Francisco, San Rafael and Novato.
| Field | Value |
|---|---|
| Area code | 628 |
| Country | United States (+1) |
| State / province | California |
| Type | Shares its towns with 415 |
| Time zone | Pacific |
| Population covered | 1,086,823 |
| Towns covered | 24 |
| ZIP codes | 89 |
| Approx. centre | 37.863, -122.496 |
Where area code 628 is used
Area code 628 is assigned to California, the United States, inside the North American Numbering Plan. Numbers in the code are written (628) NXX-XXXX at home and +1 628 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: 415. 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 628
The 24 towns below are the largest in the 628 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 |
|---|---|---|---|
| San Francisco | San Francisco County | 830,479 | 51 |
| San Rafael | Marin County | 71,922 | 5 |
| Novato | Marin County | 59,522 | 5 |
| Mill Valley | Marin County | 32,706 | 2 |
| San Anselmo | Marin County | 16,232 | 2 |
| Greenbrae | Marin County | 12,815 | 1 |
| Belvedere Tiburon | Marin County | 12,609 | 1 |
| Sausalito | Marin County | 11,724 | 2 |
| Corte Madera | Marin County | 10,077 | 2 |
| Fairfax | Marin County | 8,406 | 2 |
| Larkspur | Marin County | 7,315 | 2 |
| San Quentin | Marin County | 2,344 | 2 |
Counties covered
| County | ZIP codes |
|---|---|
| San Francisco County | 50 |
| Marin County | 38 |
| San Mateo County | 1 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 628
- Within North America: 628 + 7-digit number (628-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 628, then the 7-digit number — for example 00 1 628 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 628?
628 is a North American Numbering Plan area code assigned to California, the United States. It covers about 1,086,823 people in 24 towns.
Is 628 a US or Canadian area code?
628 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 628 in?
Area code 628 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.