Where is area code 510 located and what state is area code 510?

Area code 510 is located in California (United States), covering major cities and regions including Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Milpitas, Alameda, Union City, Newark.

How to call area code 510 and do I need to dial area code 510?

To dial a number in area code 510, format your call as +1 (510) XXX-XXXX. Mandatory 10-digit dialing is required in overlay regions.

Is area code 510 a scam, spam, or dangerous call?

Area code 510 is a legitimate geographic area code for California. However, scammers frequently spoof numbers from any area code, so exercise caution with unknown callers.

North American Area CodePacific Time Zone

Area Code 510 Location & Details

Q: What timezone is area code 510?

Area code 510 operates on the Pacific timezone.

State / Region: California • Country: United States

Major Cities Covered: Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Milpitas, Alameda, Union City, Newark

Standard Dial Format

+1 (510) XXX-XXXX

Country Code: +1 (NANP Format)

What State is Area Code 510?

CaliforniaState Hub →

Country Territory

United States

510 Area Code Time Zone

Pacific

510 Overlay Codes

341

Area Code 510 Geographic Map

Interactive location bounds and coverage area for California (Pacific Timezone)

Lat: 37.77° • Lng: -122.20°

📍 Geographic Center: CaliforniaMap data © OpenStreetMap contributors

Where is Area Code 510 Located?

Telephone area code 510 is assigned to California in United States. It serves cities and metropolitan communities including Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Milpitas, Alameda, Union City, Newark.

Historical Context & Area Code Overlay Information:510 serves California (United States).

For local and long-distance calls within area code 510, standard 10-digit dialing (510) XXX-XXXX applies.

Who Called Me from Area Code 510?

Received an unknown call, missed call, or text scam from area code 510? Here is how to trace who is calling from 510 area code and verify unknown numbers safely:

Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 510 prefix to boost pick-up rates.

Reverse Phone Lookup Area Code 510:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 510 & Dialing Format

When placing a phone call to a number in area code 510, follow the correct dialing format depending on your calling location:

Calling from inside the US / Canada (+1): Dial 1 + (510) + 7-digit number.
Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 510 + 7-digit number.
Do I need to dial area code 510 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 510

Urban centers, census places, and communities within the +1-510 calling area

17 Major Cities Listed

City Name	County	Population	% of 510 Pop
Oakland	Contra Costa County	440,838	28.2%
Fremont	Alameda County	226,442	14.5%
Hayward	Alameda County	157,113	10.1%
Berkeley	Contra Costa County	121,911	7.8%
Richmond	Marin County	114,861	7.4%
San Leandro	Alameda County	85,353	5.5%
Milpitas	Alameda County	78,596	5.0%
Alameda	San Mateo County	76,876	4.9%
Union City	Alameda County	65,282	4.2%
Newark	Alameda County	47,895	3.1%
San Pablo	Contra Costa County	31,678	2.0%
Hercules	Contra Costa County	26,326	1.7%
El Cerrito	Contra Costa County	26,121	1.7%
Albany	Contra Costa County	19,195	1.2%
Pinole	Contra Costa County	18,543	1.2%
Emeryville	Contra Costa County	13,251	0.8%
Piedmont	Contra Costa County	10,642	0.7%

Counties Covered by Area Code 510

Geographic county distribution and population coverage across California

County Name	Total Population	% of 510 Area	% of County
Contra Costa County	1,169,534	45.4%	61%
Alameda County	1,636,624	42.3%	40%
Marin County	255,704	7.4%	45%
San Mateo County	740,627	4.9%	10%

☎️Area Code 510 Exchange Prefixes & Carriers

Showing 50 of 800 central office 3-digit prefixes and assigned telecom carriers

59% Landline32% Wireless10% VoIP

Prefix	Line Usage	Rate Center	Assigned Carrier	Assign Date
(510) 200-	📱Wireless	HAYWARD	METROPCS, INC.	11/12/2008
(510) 201-	💻VoIP	OKLD MN-PD	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	02/14/2009
(510) 202-	📞Landline	OKLD MN-PD	UTILITY TELECOM GROUP, LLC - CA	N/A
(510) 203-	📱Wireless	FRNK MAIN	T-MOBILE USA, INC.	09/22/2015
(510) 204-	📞Landline	OKLD BKLY	PACIFIC BELL	N/A
(510) 205-	📱Wireless	OKLD ALMD	METROPCS, INC.	N/A
(510) 206-	📱Wireless	OKLD MN-PD	NEW CINGULAR WIRELESS PCS, LLC	N/A
(510) 207-	📱Wireless	OKLD MN-PD	NEW CINGULAR WIRELESS PCS, LLC	N/A
(510) 208-	📞Landline	OKLD MN-PD	PACIFIC BELL	N/A
(510) 209-	📱Wireless	HAYWARD	METROPCS, INC.	N/A
(510) 210-	💻VoIP	RICHMOND	BANDWIDTH.COM CLEC, LLC - CA	01/04/2013
(510) 211-	📞Landline	XXXXXXXXXX	MULTIPLE OCN LISTING	N/A
(510) 212-	📞Landline	FRNK OLIVR	SPOK, INC.	N/A
(510) 213-	📱Wireless	OKLD FRTVL	T-MOBILE USA, INC.	09/19/2002
(510) 214-	📞Landline	OKLD ALMD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	N/A
(510) 215-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 216-	📱Wireless	OKLD FRTVL	T-MOBILE USA, INC.	09/27/2019
(510) 217-	📞Landline	OKLD ALMD	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	N/A
(510) 218-	📞Landline	FRNK OLIVR	SPOK, INC.	N/A
(510) 219-	📱Wireless	OKLD MN-PD	NEW CINGULAR WIRELESS PCS, LLC	N/A
(510) 220-	📱Wireless	OKLD MN-PD	NEW CINGULAR WIRELESS PCS, LLC	N/A
(510) 221-	📱Wireless	RICHMOND	METROPCS, INC.	02/08/2007
(510) 222-	📞Landline	ELSBR-PINL	PACIFIC BELL	N/A
(510) 223-	📞Landline	ELSBR-PINL	PACIFIC BELL	N/A
(510) 224-	📱Wireless	HRCUL-RODE	T-MOBILE USA, INC.	10/18/2001
(510) 225-	📞Landline	OKLD BKLY	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	N/A
(510) 226-	📞Landline	FRNK OLIVR	PACIFIC BELL	N/A
(510) 227-	📞Landline	OKLD ALMD	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	N/A
(510) 228-	📞Landline	OKLD FRTVL	LEVEL 3 COMMUNICATIONS, LLC - CA	N/A
(510) 229-	📞Landline	OKLD BKLY	PACIFIC BELL	N/A
(510) 230-	📱Wireless	RICHMOND	T-MOBILE USA, INC.	02/15/2007
(510) 231-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 232-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 233-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 234-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 235-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 236-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 237-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 238-	📞Landline	OKLD MN-PD	PACIFIC BELL	N/A
(510) 239-	📞Landline	OKLD ALMD	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	N/A
(510) 240-	📞Landline	FRNK GRNLF	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	N/A
(510) 241-	📱Wireless	ELSBR-PINL	T-MOBILE USA, INC.	09/22/2015
(510) 242-	📞Landline	RICHMOND	PACIFIC BELL	N/A
(510) 243-	📞Landline	ELSBR-PINL	PACIFIC BELL	N/A
(510) 244-	💻VoIP	HAYWARD	BANDWIDTH.COM CLEC, LLC - CA	07/25/2011
(510) 245-	📞Landline	HRCUL-RODE	PACIFIC BELL	N/A
(510) 246-	📱Wireless	HAYWARD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	08/09/2011
(510) 247-	📞Landline	HAYWARD	PACIFIC BELL	N/A
(510) 248-	📞Landline	FRNK MAIN	LEVEL 3 COMMUNICATIONS, LLC - CA	N/A
(510) 249-	📞Landline	FRNK OLIVR	PACIFIC BELL	N/A

Frequently Asked Questions about Area Code 510

Where is area code 510 located?

Area code 510 is located in California (United States), serving cities like Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Milpitas, Alameda, Union City, Newark.