California · Pacific Time
350 Area Code
Area code 350 is in California, serving northern San Joaquin Valley and Sierra foothills including Stockton, Modesto and Merced. It is in the Pacific Time zone. It shares its territory with overlay code 209, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 350 area code?
350 is a California area code covering northern San Joaquin Valley and Sierra foothills including Stockton, Modesto and Merced. In the wider directory it sits in the West region.
Cities in the 350 area code
- Stockton
- Modesto
- Merced
- Tracy
- Manteca
- Turlock
- Lodi
- Ceres
- Los Banos
- Oakdale
- Atwater
- Riverbank
- Sonora
Counties served by 350
San Joaquin County, Stanislaus County, Merced County, Tuolumne County, Calaveras County, Amador County and Mariposa County.
350 overlay codes and dialing
The 350 territory is covered by an overlay of 2 area codes: 209, 350. All of them serve the same geographic area, and the original code is 209. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 350 area code
350 went into service on November 28, 2022 as an overlay of 209, relieving number exhaustion in the Stockton area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 350 a scam or spam risk?
350 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 350 number on your screen is no guarantee the caller is in Stockton, CA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other California area codes
Explore more
See every code in California, compare codes across the West region, or view all Pacific Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
350 area code FAQ
Where is the 350 area code?
The 350 area code is in California, covering northern San Joaquin Valley and Sierra foothills including Stockton, Modesto and Merced, in the West region.
What cities are in the 350 area code?
Cities in the 350 area code include Stockton, Modesto, Merced, Tracy, Manteca, Turlock, Lodi, Ceres, Los Banos and Oakdale.
What time zone is 350 in?
350 is in the Pacific Time zone.
What is the overlay for the 350 area code?
350 shares its territory with 209. Both codes (209, 350) serve the same area, so 10-digit dialing is required for every call.
When did the 350 area code start?
350 went into service on November 28, 2022 as an overlay of 209.
Do I have to dial 10 digits for 350?
Yes. Because 350 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 350 a toll-free or premium code?
No. 350 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.