510 Area Code
Covers Oakland and nearby communities in California.
(510) 555-0142Area code 510 map
Interactive coverage map for area code 510, centered on Oakland, California
37.8044, -122.2708
Open in OpenStreetMapArea code 510 coverage map — centered on Oakland. Shaded area shows the approximate reach around the primary city.
If you are trying to place Oakland, CA on the map, area code 510 is the one that covers it. It reaches roughly 1.3 million people across places such as Oakland, Fremont, Hayward, Berkeley and more. The region observes Pacific time, so a number like (510) 555-0142 is on that clock right now. On the ground it spans Alameda, Contra Costa. It shares its territory with the overlay code 341, which sit on the exact same map. Because the 510 region uses more than one area code, you must dial all ten digits — area code included — even for a local call. You do not, however, need to dial a leading 1 for calls within the US and Canada. On this page you'll find a live local clock for Oakland, an interactive coverage map, the cities and counties 510 serves, its overlay and neighboring codes, and tips on spotting 510 spam calls.
Cities covered by 510
Cities & neighborhoods
- Oakland
- Fremont
- Hayward
- Berkeley
- Richmond
- San Leandro
- Alameda
- Union City
- Newark
- Castro Valley
- El Cerrito
- San Lorenzo
- San Pablo
Nearby & overlay area codes
Overlay codes (same area)
These share 510’s geography — a number in either code can be on the same street.
Neighboring codes
Codes for adjacent regions and metros.
Is a call from 510 a scam?
Because 510 covers a dense metro around Oakland, it's a common source of both real business calls and spam. Legitimate 510 calls come from local businesses, offices and neighbors; scam calls in this region tend to imitate delivery services, banks and utilities. Remember that caller ID is trivially spoofed — a scammer anywhere can make a 510 number appear on your screen — so the area code alone never proves a call is genuinely local.
Red flags to watch for
- Pressure to act right now, or threats of arrest, fines, or service being cut off.
- Requests to pay with gift cards, wire transfer, crypto, or a payment app.
- Asking for passwords, one-time codes, your SSN, or full card/bank numbers.
- A robocall or recording, or a number that won’t let you call back.
When unsure, hang up and call the organization back on a number you look up yourself.
Calling a 510 number from abroad
Every 510 number is a US/Canada +1 number. From a mobile anywhere, the simplest approach is to dial it in international format:
+1 510 555-0142If your phone can’t dial the +, replace it with your country’s exit code, then 1, then the number:
- UK, Germany, France & most of Europe
00 1 510 555-0142 - Australia
0011 1 510 555-0142 - Japan
010 1 510 555-0142 - Mexico
00 1 510 555-0142
Within the US and Canada you don’t need any of this — just dial the ten digits 510 555-0142.
Reverse phone lookup
Check any US or Canada number to see whether it's a working line, which carrier it sits on, whether it's mobile, landline or VoIP, and roughly where it's registered.
Shows carrier, line type and location. Owner name isn't available here.
Results are for personal, informational use only and may not be used for employment, credit, housing or tenant-screening decisions.
Area code 510: frequently asked questions
Where is the 510 area code located?
The 510 area code is located in California, centered on Oakland. It covers Alameda, Contra Costa and nearby communities including Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro.
What time zone is 510 in?
Area code 510 is in the Pacific time zone (UTC-8 (PST) / UTC-7 (PDT)). You can see the exact current local time for Oakland on the live clock above.
What cities use area code 510?
Cities and areas that use 510 include Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro. Its primary city is Oakland, CA.
Do I need to dial 1 before 510?
For calls within the US, you do not need to dial a leading 1, but you do need all ten digits: 510 plus the seven-digit number. The 510 area requires ten-digit dialing because more than one area code serves it.
Is 510 a toll-free or scam number?
No — 510 is a normal geographic area code for Oakland, not a toll-free code (toll-free codes are 800, 833, 844, 855, 866, 877 and 888). A 510 number is not inherently a scam, but the code can be spoofed. See the spam-call section above for how to tell.
What are the overlay area codes for 510?
Area code 510 is overlaid by 341, meaning those codes cover the same geographic area.