California, United States
Pacific Time
8:14 PM
Area Code
357
State / Province
California
Country
United States
Time Zone
Pacific Time
Area code 357 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:+13575550100">+13575550100</a><a href="tel:+13575550199">+13575550199</a>Look up which exchange in California a specific 357 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
7
Assignment Blocks
25
Rate Centers
7
Carriers of Record
4
| Type | Blocks | Share |
|---|---|---|
| Landline or VoIP | 25 | 100% |
| Carrier | Blocks |
|---|---|
| ONVOY, LLC - CA | 18 |
| WIDE VOICE, LLC - CA | 3 |
| EXIANT COMMUNICATIONS LLC | 2 |
| OPENTACT INC. | 2 |
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 |
|---|---|---|
| Clovis | 1 | 5 |
| Firebaugh | 1 | 5 |
| Fresno | 1 | 2 |
| Hanford | 1 | 3 |
| Kingsburg | 1 | 4 |
| Sanger | 1 | 4 |
| Visalia | 1 | 2 |
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.
357 was activated on Mar 26, 2025 as an overlay covering California (Fresno, San Joaquin Valley). It shares the same geography as 559, which means ten-digit dialing is required for local calls in this region — dial the area code even when calling a neighbor.
A new 357 number does not indicate a different city than 559. Overlays are added when the existing code runs out of available prefixes.
See every North American overlayArea code 357 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. 357 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 357 covers 7 cities and communities in California, including Clovis, Firebaugh, Fresno, Hanford, Kingsburg, 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 357 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 357 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 + 357 + 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 1 357 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 357 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +13575550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.