Area codes 559 and 357 are telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, rea ...

s in the

North American Numbering Plan The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone ...

for the central

San Joaquin Valley The San Joaquin Valley ( ; Spanish language in California, Spanish: ''Valle de San Joaquín'') is the southern half of California's Central Valley (California), Central Valley. Famed as a major breadbasket, the San Joaquin Valley is an importa ...

in central

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

. The numbering plan area includes the counties of

Fresno Fresno (; ) is a city in the San Joaquin Valley of California, United States. It is the county seat of Fresno County, California, Fresno County and the largest city in the greater Central Valley (California), Central Valley region. It covers a ...

, Madera, Kings, and Tulare, an area largely coextensive with the

and Visalia- Porterville metropolitan areas. Area code 559 was placed in service in 1998, when its services area was

split Split(s) or The Split may refer to: Places * Split, Croatia, the largest coastal city in Croatia * Split Island, Canada, an island in the Hudson Bay * Split Island, Falkland Islands * Split Island, Fiji, better known as Hạfliua Arts, enter ...

from that of area code 209. 357 was added to form an

overlay complex In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbe ...

in 2025.

History

In 1997, the California-Nevada Code Administration (CNCA) determined that telephone number demand in the area exceeded normal forecasts, and placed area codes 209, 213, 310, 408, 619, 805, and 818 in jeopardy status of exhausting central office codes before normal relief could be implemented, triggering special conservation measures. As a result, area code 559 was created in an area code split of the 209 numbering plan area on November 14, 1998. The new area code was assigned to the southern part of 209. A permissive dialing period was maintained until May 15, 1999. Although this provided general relief, the California-Nevada Code Administration (CNCA) indicated that area code 209 remained in jeopardy status for further relief actions. Like many other regions that had experienced area code changes and additions during the first boom of wireless devices, such as cellular telephones and pagers in the 1990s, both 559 and 209 were in the early planning stages of relief, potentially creating the need for introduction of further new area codes. Yet by 2002, telephone number pooling was enforced for the 209 and 559 central offices, reducing the size of telephone number blocks allocated to carriers from 10,000 to 1,000 numbers. Area code 559 was expected to exhaust in 2025. For relief, the California Public Utilities Commission approved an all-service

with new area code 357 for an in-service date of March 26, 2025. This required the implementation of

ten-digit dialing Ten-digit dialing is a telephone dialing procedure in the countries and territories of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when Dialling (telephony), dialing to initiate a t ...

in the central San Joaquin Valley.

Service area

The area codes serve the Central California counties of

, Madera, Kings, and Tulare. The major cities within the service region are

, Coalinga, Clovis, Madera, Sanger, Reedley, Dinuba, Selma, Tulare, Visalia,

Hanford Hanford may refer to: Places *Hanford (constituency), a constituency in Tuen Mun, People's Republic of China *Hanford, Dorset, a village and parish in England *Hanford, Staffordshire, England *Hanford, California, United States *Hanford, Iowa, ...

, Lemoore, Porterville, Avenal, and Kingsburg.

Fresno County

* Auberry * Big Creek * Biola * Bowles * Calwa * Cantua Creek * Caruthers * Clovis * Coalinga * Del Rey * Dunlap * Easton * Firebaugh * Fowler *

* Friant * Huron *

Kerman Kerman (; ) is a city in the Central District (Kerman County), Central District of Kerman County, Kerman province, Kerman province, Iran, serving as capital of the province, the county, and the district. History Kerman was founded as a def ...

* Kingsburg * Knowles * Lanare * Laton * Mendota * Mercey Hot Springs * Orange Cove * Parlier * Pinedale * Prather * Raisin City * Reedley * Riverdale * Rolinda * San Joaquin * Sanger * Selma * Shaver Lake * Squaw Valley * Tollhouse *

Tranquillity Tranquillity (also spelled tranquility) is the quality or state of being tranquil; that is, calm, serene, and worry-free. The word tranquillity appears in numerous texts ranging from the religious writings of Buddhism—where the term refers to ...

Kings County

* Armona * Avenal * Corcoran *

* Hardwick * Home Garden * Kettleman City * Lemoore Station * Lemoore * Stratford

Madera County

* Ahwahnee * Bonadelle Ranchos-Madera Ranchos * Chowchilla * Coarsegold * Fish Camp * Madera Acres * Madera * Millerton * North Fork * Oakhurst * Parksdale * Parkwood *

Raymond Raymond is a male given name of Germanic origin. It was borrowed into English from French (older French spellings were Reimund and Raimund, whereas the modern English and French spellings are identical). It originated as the Germanic ᚱᚨᚷ� ...

* Yosemite Lakes

Tulare County

* Alpaugh *

Badger Badgers are medium-sized short-legged omnivores in the superfamily Musteloidea. Badgers are a polyphyletic rather than a natural taxonomic grouping, being united by their squat bodies and adaptions for fossorial activity rather than by the ...

* Cutler * Dinuba * Ducor * East Orosi * East Porterville *

Exeter Exeter ( ) is a City status in the United Kingdom, cathedral city and the county town of Devon in South West England. It is situated on the River Exe, approximately northeast of Plymouth and southwest of Bristol. In Roman Britain, Exeter w ...

* Farmersville * Goshen *

Ivanhoe ''Ivanhoe: A Romance'' ( ) by Walter Scott is a historical novel published in three volumes, in December 1819, as one of the Waverley novels. It marked a shift away from Scott's prior practice of setting stories in Scotland and in the more ...

* Lemon Cove * Lindsay *

London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...

* Orosi * Pixley * Poplar-Cotton Center * Porterville * Richgrove * Springville * Strathmore * Terra Bella * Three Rivers *

Tipton Tipton is an industrial town in the metropolitan borough of Sandwell, in the county of the West Midlands (county), West Midlands, England. It had a population of 38,777 at the 2011 UK Census. It is located northwest of Birmingham and southeas ...

* Traver * Tulare * Visalia * Woodlake * Woodville

References

External links

Area code map of California
from whitepages.com {{Coord, 37, -120, region:US-CA, display=title 559 Fresno County, California Madera County, California Kings County, California Tulare County, California San Joaquin Valley Telecommunications-related introductions in 1998 Telecommunications-related introductions in 2025 559