North American Numbers Source-cited · ownership disclosed
Area code
357
In service
United States · since 2025

Fresno (overlay)

Area code 357 is an all-services overlay of area code 559, serving the central San Joaquin Valley. It was placed in service on March 26, 2025 (re-check against NANPA).

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Fresno (overlay)
Type
geographic
Status
in service
In service since
2025
Projected exhaust
2072 Q4

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 357 is

Central San Joaquin Valley (identical footprint to 559)..

Communities served wholly or partly by 357:

FresnoVisaliaTulareHanfordPorterville

Identical service area to 559.

B · Relationships

How it relates to other codes

The codes 357 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2025 559 Fresno 357 overlays the same geography as parent code 559.
What's changing. Overlay of 559 in service since March 26, 2025; ten-digit dialing required (re-check against NANPA).
C · History

How 357 got here

2025-03-26
Area code 357 placed in service as an all-services overlay of 559, approved by the CPUC to relieve exhaustion; required ten-digit dialing.
Source: CPUC news release + Wikipedia
D · Capacity

How full it is

Prefixes assigned
20
Prefixes available
780
Thousands-blocks assigned
13

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 357 with another code →
Sources
Wikipedia ↗
Area codes 559 and 357
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.