Where is the 628 area code?

Area code 628 covers Oakland and San Francisco in California, on Pacific Time.

What time zone is area code 628 in?

Numbers in the 628 area code sit in Pacific Time.

Is 628 a toll-free or scam area code?

No. 628 is a geographic North American Numbering Plan area code assigned to California. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 628 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

628 area code

Where the 628 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: CA
Cities covered: 2
Counties: 2
Time zone: Pacific Time

Quick answer

Area code 628 serves Oakland and San Francisco in California. It sits in Pacific Time and covers 2 counties and about 22 ZIP codes across the metros we track. Numbers there are also dialled as 415, 510, 650, 707, 916, 925.

Cities in the 628 area code

Each city links to its full local profile: sales tax, housing, income and ZIP codes.

City	County	Time zone	ZIP codes
Oakland, CA	Alameda County	PST/PDT	10
San Francisco, CA	San Francisco County	PST/PDT	12

Related area codes

Codes that share or border the same calling area.

628 area code FAQ

The questions people ask about this code.

Where is area code 628?

628 is a geographic area code in California, covering Oakland and San Francisco.

What time is it in the 628 area code?

628 observes Pacific Time (PST/PDT).

Is 628 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.