North American Numbers Source-cited · ownership disclosed
Area code
559
In service
United States · since 1998

Fresno

Area code 559 serves the central San Joaquin Valley, including Fresno, Visalia, and Tulare. It split from area code 209 on November 14, 1998 and is overlaid by area code 357.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Fresno
Type
geographic
Status
in service
In service since
1998
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 559 is

Central San Joaquin Valley across counties including Fresno, Madera, Kings, Tulare, Mariposa and part of Merced..

Communities served wholly or partly by 559:

FresnoVisaliaTulareHanfordPorterville

Representative list of major cities, not exhaustive.

B · Relationships

How it relates to other codes

The codes 559 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?

Split from · 1998 209 Stockton 559 was created on November 14, 1998 by a split of the 209 numbering plan area.
Overlay · 2025 357 Fresno (overlay) All-services overlay of 559, in service March 26, 2025; re-check against NANPA.
What's changing. Overlaid by area code 357 since March 26, 2025; ten-digit dialing in effect.
C · History

How 559 got here

1998-11-14
Area code 559 created in a split of area code 209; permissive dialing through May 15, 1999.
Source: Wikipedia
2025-03-26
Overlay area code 357 placed in service, with ten-digit dialing in the central San Joaquin Valley.
Source: CPUC news release + Wikipedia
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
4,481

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

Compare 559 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.