Area code
559
559 is a United States area code. Under the North American Numbering Plan it belongs to California, which has 41 area codes in total.
Validate a number in 559
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
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Area code 559 at a glance
NANPA lists 779 central office codes (prefixes) in use in area code 559, held by 45 holders across 60 rate centers.
| Fact | Value |
|---|---|
| In service since | 1998-11-14 |
| Time zone | Pacific (P) |
| Assigned overlays | 357 (2025-03-26) |
| Prefixes in use | 779 |
| Pooled prefixes | 614 (79%) |
| Rate centers | 60 |
| Companies holding prefixes | 45 |
| Assignment dates on file | 2001-03-01 to 2026-05-11 (290 prefixes) |
| ZIP codes in its places | 130 |
Rate centers in area code 559
| Rate center | Prefixes | Share |
|---|---|---|
| FRESNO | 261 | 34% |
| VISALIA | 81 | 10% |
| CLOVIS | 40 | 5% |
| MADERA | 34 | 4% |
| HANFORD | 31 | 4% |
| PORTERVL | 29 | 4% |
| TULARE | 25 | 3% |
| DINUBA | 13 | 2% |
| 52 other rate centers | 265 | 34% |
Who holds the prefixes in 559
Pacific Bell holds the most prefixes, 182 (23%). 79% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Pacific Bell | 182 | 23% |
| New Cingular Wireless PCS | 123 | 16% |
| Onvoy | 56 | 7% |
| T-Mobile USA | 56 | 7% |
| Verizon Wireless | 51 | 7% |
| Level 3 Communications | 44 | 6% |
| 39 other carriers | 267 | 34% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 559
- 1958-01-01 Area code 209, named as the parent of 559 in the NANPA report, was in service.
- 1998-11-14 Area code 559 went into service.
- 2025-03-26 Area code 357 went into service as an overlay in the same area as 559.
Area codes nearest to 559
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
- 357
ZIP codes in area code 559
130 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Fresno, CA | 58 |
| Modesto, CA | 10 |
| Visalia, CA | 6 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 559 numbers
2,681 FCC complaints are on file for 1,848 numbers in 559, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 107 |
| 2024 | 108 |
| 2025 | 95 |
Other area codes in California
California is one state with 41 area codes in the NANPA table. 559 is one of them.
- 209
- 213
- 279
- 310
- 323
- 341
- 350
- 357
- 369
- 408
- 415
- 424
- 442
- 510
- 530
- 562
- 619
- 626
- 628
- 650
- 657
- 661
- 669
- 707
- 714
- 738
- 747
- 760
- 805
- 818
- 820
- 831
- 837
- 840
- 858
- 909
- 916
- 925
- 949
- 951
Next to 559 in the numbering table
These are the codes just before and after 559 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 559 was first assigned in California. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in California next to a 559 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 559
Where is area code 559?
NANPA assigns area code 559 to California, United States.
In which state does area code 559 sit?
California. 559 is one of 41 area codes the NANPA table assigns to the state.
Which places does area code 559 cover?
The places with the most ZIP codes among the rate centers in 559 are Fresno, CA, Modesto, CA and Visalia, CA. The rate center list on this page shows all of them.
Who owns area code 559?
NANPA assigns area codes. Within 559, Pacific Bell holds the most prefixes, 182 prefixes or 23%.
Which time zone does 559 use?
The NANPA NPA report lists the time zone for 559 as Pacific (P).
What year did 559 enter service?
The NANPA NPA report gives an in-service date of 1998-11-14, so 559 has been in use since 1998.
Does area code 559 have an overlay?
Yes. 357 (in service 2025-03-26) shares the same area with 559, so numbers from all of them are local to each other.
Which area codes are nearest to 559?
The area codes closest to 559, measured between the centers of the ZIP code places they serve, are 209 (about 59 miles), 350 (about 98 miles), 831 (about 107 miles), 408 (about 115 miles) and 669 (about 123 miles).
How many prefixes does area code 559 have?
NANPA's report dated 2026-10-17 lists 779 prefixes in service in 559, spread over 60 rate centers and 45 holders.
Are there complaints about 559 numbers?
The FCC data on file has 2,681 complaints for 1,848 numbers in 559. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.