---
title: "Area code 559: California, United States"
url: "https://lookvalid.com/area-code/559.md"
canonical_url: "https://lookvalid.com/area-code/559"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 559 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California."
---

# Area code 559: California, United States

Area code 559 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California.

NANPA lists 779 central office codes (prefixes) in use in area code 559, held by 45 holders across 60 rate centers.
Pacific Bell holds the most prefixes, 182 (23%). 79% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 2,681 complaints on file for 1,848 numbers in 559, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 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.

## Nearest area codes

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).

## ZIP codes

130 ZIP codes fall in places that have a rate center in this area code. The places with the most are Fresno, CA (58 ZIP codes), Modesto, CA (10 ZIP codes) and Visalia, CA (6 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

2,681 complaints for 1,848 numbers. Numbers whose latest complaint falls in each year:

- 2023: 107
- 2024: 108
- 2025: 95

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).