Area codes 209 and 350

Area codes 209 and 350 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. Their service area includes Stockton, Modesto, Turlock, Merced, Winton, Atwater, Livingston, Manteca, Ripon, Tracy, Lodi, Galt, Sonora, Los Banos, San Andreas, Mariposa, and Yosemite, the northern San Joaquin Valley (part of the Central Valley), and the Sierra Foothills.

Numbering plan areas in California (blue) and border states. Area code 209 is shown in red.

Area code 209 was created in an area code split from area code 415 on October 26, 1957. On November 14, 1998, the southern half of this numbering plan area was split off into area code 559.

On October 24, 2021, 209 was transitioned to 1+10-digit dialing despite not being part of an overlay numbering plan at that time. 209 had telephone numbers assigned for the central office code 988, which was designated to become a nationwide 3-digit dialing code for the 988 Suicide & Crisis Lifeline in 2022. This created a conflict for all NPAs with central office codes of 988 that still permitted seven-digit dialing,[1] requiring all such NPAs to transition to either 10-digit or 1+10-digit dialing.

On November 28, 2022, the 209 numbering plan area was assigned area code 350 as an overlay to address the predicted exhaustion of 209 due to increasing code assignments in the area.[2] The network preparation period was able to be expedited since ten-digit dialing was already in effect.[3]