San Jose and Silicon Valley are served by the 408 area code, joined by two overlays – 669 (2012) and 738 (2024). All three cover the same Santa Clara County region, so 10-digit dialing is required for every local call.
Fast Facts: San Jose Area Codes
| City | San Jose, California |
| Primary Area Code(s) | 408 |
| Overlay Area Code(s) | 669, 738 |
| Time Zone | Pacific Time (PT) – PST / PDT |
| Major Counties | Santa Clara |
| Dialing | 10-digit required |
Area Codes in San Jose – Detailed Breakdown
408 – San Jose & Santa Clara County
The original code for the region since 1959, 408 covers San Jose – the largest city in Northern California – and the Santa Clara County heart of Silicon Valley.
669 – Silicon Valley overlay
Introduced in 2012 as the first overlay of 408, 669 serves the same San Jose and Santa Clara County territory.
738 – Silicon Valley overlay (newest)
Added in 2024 as the second overlay, 738 is the newest code for the region and appears mostly on recently activated numbers.
Neighborhoods & District Mapping
The 408, 669, and 738 codes cover every San Jose neighborhood, including Downtown, Willow Glen, the Rose Garden, Almaden Valley, Evergreen, Berryessa, Cambrian Park, and North San Jose’s tech corridor. The same codes serve the surrounding Silicon Valley cities of Santa Clara, Sunnyvale, Milpitas, Campbell, Los Gatos, Saratoga, Cupertino, and Gilroy and Morgan Hill to the south.
San Jose is the third-largest city in California and the civic capital of Silicon Valley, home to the headquarters of technology giants such as Cisco, Adobe, PayPal, and eBay, with Apple and Nvidia nearby. Decades of explosive growth in the tech industry drove enormous demand for phone numbers, which is why the region needed two overlays on top of its original 408 code. Every local call now requires 10 digits.
Local Dialing Rules & International Calls
Because 408 now shares overlays with 669 and 738, 10-digit dialing is required for every local call in the San Jose area. To call a San Jose number from outside the United States, dial your country’s exit code, then +1 (the North American country code), then the 10-digit number (area code + seven-digit line number).
Major ZIP Codes in San Jose
San Jose ZIP codes run roughly 95101–95196, with surrounding Santa Clara County cities such as Santa Clara (95050), Sunnyvale (94085–94089), and Cupertino (95014) covered by nearby codes.
Spam & Scam Call Warnings in San Jose
Scammers often spoof local San Jose numbers to seem trustworthy. Watch for these tactics reported across the area:
| Scam Type | What to Watch For |
|---|---|
| Tech Recruiter / Job Scam | Fake tech-company recruiter offers seeking personal data, bank details, or upfront “equipment” fees. |
| Utility Shut-off | Fake PG&E reps threatening to cut power unless you pay immediately – a scam that has repeatedly targeted Bay Area businesses. |
| Crypto / Investment Scam | Calls pitching fake cryptocurrency or startup investments promising guaranteed returns. |
| IRS / Tax Scam | Callers threatening arrest over supposed unpaid taxes, demanding gift cards or wire transfers. |
Red Flag: The IRS, Social Security Administration, and utilities like Pacific Gas and Electric (PG&E) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Hang up and verify using an official number.
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Nearby California Cities
Frequently Asked Questions
What area codes does San Jose use?
San Jose uses the 408 area code plus its 669 and 738 overlays, all covering Santa Clara County and Silicon Valley.
Do I have to dial 10 digits in San Jose?
Yes. Because 408 shares overlays with 669 and 738, you must dial the full 10-digit number for every local call.
Is 738 a new San Jose area code?
Yes. 738 entered service in 2024 as the newest overlay of 408, covering the same San Jose and Santa Clara County region.
What county is San Jose in?
San Jose is the seat of Santa Clara County, at the southern end of the San Francisco Bay Area.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
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