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AREA CODE · CALIFORNIA

Area code 510

Area code 510 covers Oakland: Main-Piedmont DA, California. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: California Major City: Oakland: Main-Piedmont DA Pacific Time (PT) Overlay: 341/510
01 / WHERE IT IS

Where is area code 510?

Area code 510 is assigned to Oakland: Main-Piedmont DA and the surrounding region in California. Calls to numbers that start with 510 are routed to this area.

Area code 510 shares its territory with 341. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

Alameda CountyContra Costa County

Line types

  • Mobile 28.63%
  • Landline 71.37%
02 / MAP

Area code 510 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Oakland: Main-Piedmont DA

This area code is in the Pacific Time (PT) time zone.

Local timeOakland: Main-Piedmont DA, CA--:--:--

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America/Los_AngelesLive
04 / HOW TO DIAL

How to call Oakland: Main-Piedmont DA

WITHIN THE US510 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 510 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 510 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 510 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 510 555 0123
🇦🇺Australia0011 1 510 555 0123
🇯🇵Japan010 1 510 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 510

Share of the number blocks by carrier and line type.

Landline

AT&T
53%
Verizon Business
9%
Metro by T-Mobile
8%
Lumen Technologies
8%
Sinch
7%
Others
16%

Mobile

AT&T Mobility
35%
T-MOBILE USA
29%
Verizon Wireless
27%
USA Mobility
7%
33 Wireless
1%
Others
2%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 510

786 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(510) 200 Landline Hayward Metro by T-MobileMETROPCS, INC.
(510) 201 Landline Oakland: Main-Piedmont DA InfobipPEERLESS NETWORK OF CALIFORNIA, LLC - CA
(510) 202 Landline Oakland: Main-Piedmont DA Utility TelecomUTILITY TELECOM GROUP, LLC - CA
(510) 203 Mobile Fremont-Newark: Main DA T-MOBILE USAT-MOBILE USA, INC.
(510) 204 Landline Oakland: Berkeley DA AT&TPACIFIC BELL
(510) 205 Landline Oakland: Alameda DA Metro by T-MobileMETROPCS, INC.
(510) 206 Mobile Oakland: Main-Piedmont DA AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(510) 207 Mobile Oakland: Main-Piedmont DA AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(510) 208 Landline Oakland: Main-Piedmont DA AT&TPACIFIC BELL
(510) 209 Landline Hayward Metro by T-MobileMETROPCS, INC.

Showing 10 of 786 prefixes

07 / FAQ

Frequently asked questions about area code 510

Where is area code 510 used?
Area code 510 serves Oakland: Main-Piedmont DA and the surrounding area in California, including Alameda County, Contra Costa County.
What city is area code 510 from?
The main city of area code 510 is Oakland: Main-Piedmont DA, CA.
What time zone is area code 510 in?
Area code 510 is in the Pacific Time (PT) time zone (America/Los_Angeles).
Is 510 an overlay area code?
Yes. It shares its territory with 341. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 510 from the United States?
Dial the 10 digits: 510 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 510 number from another country?
Dial your country's exit code (or +), then 1, then 510 and the seven-digit number. From a mobile you can use +1 510 XXX XXXX.
Which carriers use area code 510?
Most landline blocks belong to AT&T and most mobile blocks to AT&T Mobility. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 510 for landlines, mobiles or both?
Both. About 71.37% of the number blocks are landline, 28.63% mobile.
How do I save a 510 number in WhatsApp or my phone?
Save it in international format: +1 510 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 510?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

Nearby area codes

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Other area codes in California

209 · Modesto213 · Los Angeles310 · Compton: Gardena DA323 · Los Angeles341 · Fremont-Newark: Main DA350 · Modesto369 · Santa Rosa408 · San Jose: West DA415 · San Francisco: Central DA424 · Beverly Hills442 · Victorville: Victorville DA530 · Chico559 · Fresno562 · Long Beach619 · San Diego: San Diego DA626 · Alhambra628 · San Francisco: Central DA650 · Palo Alto657 · Anaheim661 · Bakersfield: Main DA669 · San Jose: West DA707 · Santa Rosa714 · Anaheim747 · Burbank: Burbank DA760 · Palm Springs805 · Santa Barbara818 · Van Nuys820 · Camarillo831 · Salinas840 · Pomona858 · La Jolla909 · Ontario916 · Sacramento: Main DA925 · Walnut Creek949 · Irvine951 · Riverside

View all California area codes →