The 350 area code is an overlay serving the northern San Joaquin Valley of California. Introduced in 2024, it was layered directly on top of the established 209 area code to supply fresh phone numbers across the Stockton and Modesto region of the Central Valley.
Quick Summary of the 350 Area Code
| Area Code | 350 |
| State | California (CA) |
| Region | Central Valley (Stockton, Modesto & Merced) |
| Major Cities | Stockton, Modesto, Merced, Turlock, Manteca, Tracy, Lodi, Ceres |
| Time Zone | Pacific Time (PT) – PST / PDT |
| Dialing Format | 10-digit dialing required |
Geographic Coverage
The 350 area code shares an identical footprint with 209, covering the northern San Joaquin Valley including Stockton, Modesto, Merced, Turlock, Manteca, Tracy, Lodi, and Ceres. Because it is an overlay rather than a separate region, a 350 number and a 209 number can exist on the same street.
Time Zone
The 350 area code observes Pacific Time (PT) – PST / PDT. Clocks follow Pacific Standard Time (UTC−8) in winter and shift to Pacific Daylight Time (UTC−7) from mid-March through early November. All of this region is on Pacific Time. shares the same clock as the rest of California and the West Coast, so a 9:00 AM call from another California city reaches this number at 9:00 AM local time.
Tip: Business hours across the 350 region generally run 9:00 AM to 5:00 PM local time, Monday through Friday.
How to Dial a 350 Number
Because area code 350 operates as part of an overlay, 10-digit dialing is mandatory for every local and long-distance call. You must dial the full 10-digit number (350 + the seven-digit line number) even when calling a neighbor across the street. For international callers, dial your country’s exit code, then +1 (the North American country code), then 350, followed by the seven-digit local number.
Scam Alerts for the 350 Area Code
Like every U.S. area code, 350 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Stockton, Modesto, Merced, Turlock, Manteca, Tracy, Lodi, Ceres should stay alert to the following common tactics:
| Scam Type | What to Watch For |
|---|---|
| IRS / Tax Scams | Threatening calls demanding immediate tax payment via gift cards or wire transfer. |
| Utility Shut-off | Impostors claiming to be PG&E threatening to cut power. |
| Farm / Equipment Scam | Fraudulent online listings for tractors or farm equipment aimed at Central Valley buyers. |
| Tech Support Fraud | Pop-ups or calls claiming your computer is infected and asking for remote access. |
If you receive a suspicious call from a 350 number, take these steps to protect yourself:
- Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
- Hang up and verify by calling the organization back using an official number from its website.
- Report the call to the FTC at reportfraud.ftc.gov and to the California Attorney General’s Office.
- Block the number and consider registering with the National Do Not Call Registry.
Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your local utility company (Pacific Gas and Electric (PG&E)) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 350 caller making such a demand is a scammer.
History and Economy of the 350 Region
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The 350 area code entered service in 2024 as an overlay for the entire 209 region. Overlays let regulators add a fresh supply of phone numbers to a crowded area without forcing existing customers to change their established numbers, so 350 covers precisely the same cities as 209. The regional economy is anchored by agriculture – the San Joaquin Valley is one of the most productive farming regions on earth – along with food processing, the inland Port of Stockton and its distribution and logistics industry, wine production around Lodi and Modesto, and the University of California, Merced. Because 350 is brand new, it appears almost exclusively on recently activated phone lines.
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Looking Up a 350 Number
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To identify a 350 caller, use a reverse phone lookup or search the complete 10-digit number online. Because 350 is the newest code in the Central Valley, many numbers will have little public footprint yet, so treat unexpected 350 calls with extra caution and never share sensitive information with an unverified caller.
Nearby & Related Area Codes
California is served by several area codes. If you are researching 350, these neighboring and overlay codes are worth knowing:
- 209 – Central Valley (overlay partner)
- 916 – Sacramento
- 559 – Fresno & the southern San Joaquin Valley
You can also browse our full directory of California area codes for more regional guides.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions
Where is the 350 area code located?
The 350 area code serves the northern San Joaquin Valley as an overlay of 209, covering Stockton, Modesto, Merced, Turlock, Manteca, Tracy, and Lodi.
Why does 350 cover the same area as 209?
350 is an overlay added in 2024 because the 209 region ran short of available phone numbers. Both codes serve the exact same geographic area.
Do I have to dial 10 digits for 350?
Yes. Overlay area codes like 350 always require 10-digit dialing for local calls.
Is 350 a new area code?
Yes. Introduced in 2024, 350 is one of the newest area codes in California and observes Pacific Time (PST/PDT).
Related 350 Guides
- Worried about spam or robocalls? Browse our Scam Alerts directory.