California, United States
Pacific Time
10:23 PM
Area Code
510
State / Province
California
Country
United States
Time Zone
Pacific Time
Area code 510 covers 7 cities and communities across California, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+15105550100">+15105550100</a><a href="tel:+15105550199">+15105550199</a>Look up which exchange in California a specific 510 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
786 active prefixes in this area code, assigned as 5,916 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 5,916
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 510-200 | 0 | Hayward | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SNFCCASY5MD | 722 | — | — |
| 510-200 | 1 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-200 | 2 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-200 | 3 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-200 | 4 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-200 | 5 | Hayward | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-200 | 6 | Hayward | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-200 | 7 | Hayward | Landline or VoIP | COMCAST PHONE OF CALIFORNIA, LLC (394L) | OKLDCA03XOY | 722 | — | — |
| 510-200 | 8 | Hayward | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-200 | 9 | Hayward | Landline or VoIP | COMCAST PHONE OF CALIFORNIA, LLC (394L) | OKLDCA03XOY | 722 | — | — |
| 510-200 | A | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-201 | 0 | Oakland: Main-Piedmont DA | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-201 | 1 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 2 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 3 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 4 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 5 | Oakland: Main-Piedmont DA | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-201 | 6 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 7 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 8 | Oakland: Main-Piedmont DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-201 | 9 | Oakland: Main-Piedmont DA | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-201 | A | Oakland: Main-Piedmont DA | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-202 | A | Oakland: Main-Piedmont DA | Landline or VoIP | UTILITY TELECOM GROUP, LLC - CA (9262) | SNFCCAMKX1X | 722 | — | — |
| 510-203 | 0 | Fremont-Newark: Main DA | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 510-203 | 1 | Fremont-Newark: Main DA | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SNFCCASY5MD | 722 | — | — |
| 510-203 | 2 | Fremont-Newark: Main DA | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 510-203 | 3 | Fremont-Newark: Main DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-203 | 4 | Fremont-Newark: Main DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-203 | 5 | Fremont-Newark: Main DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-203 | 6 | Fremont-Newark: Main DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-203 | 7 | Fremont-Newark: Main DA | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 510-203 | 8 | Fremont-Newark: Main DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-203 | 9 | Fremont-Newark: Main DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-203 | A | Fremont-Newark: Main DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-204 | A | Oakland: Berkeley DA | Landline | PACIFIC BELL (9740) | BERKELEY | 722 | — | — |
| 510-205 | 0 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 1 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 2 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 3 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 4 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 5 | Oakland: Alameda DA | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 6 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 7 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 8 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | 9 | Oakland: Alameda DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-205 | A | Oakland: Alameda DA | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-206 | A | Oakland: Main-Piedmont DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-207 | A | Oakland: Main-Piedmont DA | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 510-208 | A | Oakland: Main-Piedmont DA | Landline | PACIFIC BELL (9740) | OAKLAND FRANKLIN | 722 | — | — |
| 510-209 | 0 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 1 | Hayward | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 2 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 3 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 4 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 5 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 6 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 7 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 8 | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-209 | 9 | Hayward | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-209 | A | Hayward | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-210 | 0 | Richmond | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-210 | 1 | Richmond | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-210 | 2 | Richmond | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 510-210 | 3 | Richmond | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-210 | 4 | Richmond | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 510-210 | 5 | Richmond | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-210 | 6 | Richmond | Landline or VoIP | SONIC TELECOM, LLC - CA (433E) | SANTA ROSA | 722 | — | — |
| 510-210 | 7 | Richmond | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-210 | 8 | Richmond | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-210 | 9 | Richmond | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-210 | A | Richmond | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-212 | A | Fremont-Newark: Oliver DA | Landline or VoIP | SPOK, INC. (6630) | SNFCCA21XEZ | 722 | — | — |
| 510-213 | 0 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 1 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 2 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 3 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 4 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 5 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | 6 | Oakland: Fruitvale DA | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SNFCCASY5MD | 722 | — | — |
| 510-213 | 7 | Oakland: Fruitvale DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-213 | 8 | Oakland: Fruitvale DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-213 | 9 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-213 | A | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-214 | 0 | Oakland: Alameda DA | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (7240) | HAYWARD | 722 | — | — |
| 510-214 | 1 | Oakland: Alameda DA | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (7240) | HAYWARD | 722 | — | — |
| 510-214 | 2 | Oakland: Alameda DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-214 | 3 | Oakland: Alameda DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-214 | 4 | Oakland: Alameda DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-214 | 5 | Oakland: Alameda DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-214 | 6 | Oakland: Alameda DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-214 | 7 | Oakland: Alameda DA | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 510-214 | 8 | Oakland: Alameda DA | Landline or VoIP | IP HORIZON LLC (515J) | — | 722 | — | — |
| 510-214 | 9 | Oakland: Alameda DA | Landline or VoIP | TERRA NOVA TELECOM INC. (145J) | — | 722 | — | — |
| 510-214 | A | Oakland: Alameda DA | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (7240) | HAYWARD | 722 | — | — |
| 510-215 | A | Richmond | Landline | PACIFIC BELL (9740) | RICHMOND MAIN | 722 | — | — |
| 510-216 | 0 | Oakland: Fruitvale DA | Landline or VoIP | TELNYX LLC (073H) | SNJUCACL3MD | 722 | — | — |
| 510-216 | 1 | Oakland: Fruitvale DA | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | SAN JOSE | 722 | — | — |
| 510-216 | 2 | Oakland: Fruitvale DA | Wireless | T-MOBILE USA, INC. (6529) | OKLECAZV1MD | 722 | — | — |
| 510-216 | 3 | Oakland: Fruitvale DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
| 510-216 | 4 | Oakland: Fruitvale DA | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | SNFCCA21XUY | 722 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
786
Assignment Blocks
5,916
Rate Centers
13
Carriers of Record
39
| Type | Blocks | Share |
|---|---|---|
| Landline | 1,153 | 19% |
| Landline or VoIP | 3,088 | 52% |
| Wireless | 1,675 | 28% |
| Carrier | Blocks |
|---|---|
| PACIFIC BELL | 1,153 |
| T-MOBILE USA, INC. | 707 |
| METROPCS, INC. | 630 |
| ONVOY, LLC - CA | 618 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 478 |
| BANDWIDTH.COM CLEC, LLC - CA | 455 |
| NEW CINGULAR WIRELESS PCS, LLC | 411 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 290 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 224 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 145 |
| 29 other carriers | 805 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Oakland: Main-Piedmont DA | 205 | 1,200 |
| Hayward | 117 | 957 |
| Fremont-Newark: Main DA | 81 | 621 |
| Oakland: Berkeley DA | 70 | 560 |
| Oakland: Trinidad DA | 60 | 449 |
| Richmond | 53 | 413 |
| Fremont-Newark: Oliver DA | 45 | 345 |
| Oakland: Alameda DA | 42 | 372 |
| Oakland: Fruitvale DA | 39 | 325 |
| El Sobrante-Pinole | 28 | 248 |
| Fremont-Newark: Greenleaf DA | 25 | 215 |
| Hercules-Rodeo | 14 | 134 |
| Crockett | 7 | 77 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 510 is a North American Numbering Plan (NANP) telephone area code assigned to California, United States. It is one of 41 area codes serving California. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 510 is an active North American Numbering Plan (NANP) area code, currently assigned to California, United States. It is safe to answer or dial calls using this area code.
Area code 510 covers 7 cities and communities in California, including Crockett, El Sobrante-Pinole, Fremont-Newark, Hayward, Hercules-Rodeo, and 2 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 510 area code observe Pacific Time (IANA timezone: America/Los_Angeles). Pacific Time is UTC−8 in winter (PST) and UTC−7 in summer (PDT). When placing a call to a 510 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within California, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 510 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 510 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 510 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +15105550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.