Where Is Area Code 510 Located?

Area code 510 covers Oakland and surrounding areas in California. It was activated in 1991 as an overlay of area code 415. Today it shares its territory with overlay code 341. For the full picture, see all California area codes.

History of Area Code 510

Area code 510 was activated on September 2, 1991 in connection with area code 415. The decision was driven by population growth and the exhaustion of available phone numbers in the original numbering plan area.

Since its activation, the geographic area covered by 510 has been reshaped by the following splits:

• 1991 — area code 510 split off to cover Area code 510 was created on September 2, 1991, in a split of area code 415, giving the East Bay its own numbering plan area separate from San Francisco.
• 1998 — area code 925 split off to cover On March 14, 1998, the inland East Bay east of the Berkeley Hills was split off and assigned area code 925, covering cities such as Walnut Creek, Concord, Antioch, and the Tri-Valley.

Overlay codes have been added to the same geographic territory in:

• 2019 — area code 341 activated as an overlay

Cities and Areas Served by 510

Area code 510 serves East Bay — western Alameda County and parts of Contra Costa County, eastern shore of San Francisco Bay from Richmond in the north to Fremont in the south, including the following cities and communities:

• Oakland
• Berkeley
• Fremont
• Hayward
• Richmond
• Alameda
• El Cerrito
• San Leandro

Nearby area codes covering the same broader region include: 415, 341, 925, 628.

Overlay Codes 510

Area code 341 shares the same geographic territory as 510 (added in 2019). New phone numbers in the region may be assigned either code.

Because multiple area codes serve the same area, ten-digit dialing is mandatory for all local calls. A call from any of these codes originates from the same geographic region in California.

The Cultural Weight of a 510 Number

Area code 510 was carved out of the legendary 415 on September 2, 1991, as Bay Area population growth, fax machines, pagers, and early mobile phones pushed the 415 numbering pool to the brink. The split gave the East Bay — Oakland, Berkeley, Fremont, Hayward, Richmond, and the surrounding communities — a distinct telephonic identity for the first time. The code’s footprint shrank again on March 14, 1998, when the inland suburbs east of the Berkeley Hills were reassigned to the new 925 area code. By 2016 the California Public Utilities Commission projected that 510 would exhaust its remaining numbers by early 2019; rather than force another disruptive geographic split, regulators approved overlay code 341, which went live on July 22, 2019, making ten-digit dialing mandatory throughout the East Bay. The 510 also has a footnote in telecom history predating its telephone use: AT&T assigned NPA 510 for Teletypewriter Exchange Service (TWX) dial conversion in 1962, a use that was decommissioned in 1981 after Western Union converted to new transmission technologies.

From the moment the Oakland Tribune declared on January 27, 1992 — the official public switchover date — that “the magic number is 510,” the code became inseparable from East Bay identity. Oakland rappers and hyphy-era artists including Mistah F.A.B. and Iamsu! have referenced the 510 in their music, while local businesses from 510 Skateboarding in Berkeley to the cannabis dispensary Root’d in the 510 in Oakland’s Temescal neighborhood have built their brands around the digits. Residents celebrate 510 Day every May 10, an annual event co-founded by Oakland educator and media maker Leon Sykes to honor East Bay culture. The code is informally nicknamed “the nickel and dime” — a nod to its three digits — and for longtime residents, holding a 510 number is a deliberate declaration of East Bay roots distinct from San Francisco’s 415.

How to Get a Phone Number with Area Code 510

There are three ways to get a phone number with the 510 area code, each suited to a different need:

1. Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 510 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 510 inventory.
2. Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 510 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
3. Port an existing 510 number. If you already have a 510 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of California sometimes can’t accept inbound ports of 510 numbers due to 911 routing rules.

Looking for a 510 number? 212areacode.com offers premium 510 numbers for Oakland, California — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 510 numbers →

Frequently Asked Questions

Is the 510 area code still in use?
Yes. 510 is actively assigned to new phone lines in East Bay — western Alameda County and parts of Contra Costa County, eastern shore of San Francisco Bay from Richmond in the north to Fremont in the south.

What is the difference between 510 and 341?
Today they share the same geographic territory in California. New phone lines in the area may be assigned either code. The two codes work identically for calling, billing, and service.

What is the parent area code of 510?
Area code 510 is an overlay of 415. Both codes serve the same region of California.

Can I get a 510 number if I don't live in California?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 510 number from anywhere in the world. The number routes to whatever device or carrier you specify.

Is 510 a scam area code?
No. 510 is a legitimate, active area code for East Bay — western Alameda County and parts of Contra Costa County, eastern shore of San Francisco Bay from Richmond in the north to Fremont in the south. Like any area code, scammers occasionally spoof 510 caller IDs, but the code itself is heavily used by real California businesses, government offices, and residents.

What cities does the 510 area code cover?
Area code 510 covers the western East Bay of the San Francisco Bay Area, including Oakland, Berkeley, Fremont, Hayward, Richmond, Alameda, San Leandro, El Cerrito, Albany, Piedmont, Hercules, Pinole, and San Pablo, among others. It excludes the inland East Bay cities of Dublin, Livermore, and Pleasanton, which fall under area code 925.

What is the overlay code for 510, and do I need to dial ten digits?
Area code 341 is the overlay for 510, active since July 22, 2019. Ten-digit dialing (area code + seven-digit number) became mandatory in the East Bay on June 22, 2019, and is required for all local calls within the 510/341 numbering plan area.

Why was area code 510 created?
510 was split from area code 415 on September 2, 1991, because Bay Area population growth and the proliferation of fax machines, pagers, and early mobile phones exhausted the available 415 number pool. The split gave the East Bay its own area code for the first time.

Is the 510 area code the same as 341?
They cover the same geographic territory, but they are different codes. Existing subscribers kept their 510 numbers; new lines after July 2019 may be assigned either 510 or 341. Both codes are local to the East Bay and require ten-digit dialing when calling between them.

Related Reading

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• Why Use Area Codes For Local Calls?
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