Area code 559

[2] 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.

For relief, an all-service overlay complex with new area code 357 is planned.

This requires the implementation of ten-digit dialing in the central San Joaquin Valley beginning February 2025.

[3] The area code serves the Central California counties of Fresno, Madera, Kings, and Tulare.

The major cities within the service region are Fresno, Coalinga, Clovis, Madera, Sanger, Reedley, Dinuba, Selma, Tulare, Visalia, Hanford, Lemoore, Porterville, Avenal, and Kingsburg.