Pick 408 if you want the code Sunnyvale has had longest.
It began in 1959, and Sunnyvale is on the list of places it serves, beside Santa Clara and Milpitas.
The area codes for Sunnyvale are 408 and 669.
Area codes in Sunnyvale
Get a phone number with the right area code for Sunnyvale.
Sunnyvale lies between San Jose and Palo Alto and is in the area of 408 and 669. A number in either code is a Sunnyvale number, and neither is more local.
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Pick 408 or 669 for Sunnyvale, because both cover it and neither is more local.
Pick 669 if the newer code suits the number better.
It joined in 2012 and serves the same ground, from Milpitas down to Gilroy.
Pick 650 if the number is for Mountain View or Palo Alto.
Those two cities lie just north of Sunnyvale, in the 650 area. Only a small part of Palo Alto is in 408.
People filed 129 FCC complaints about unwanted calls from Sunnyvale area codes in 12 months.
From October 2025 to September 2026, 129 unwanted-call complaints filed with the FCC gave a caller ID number that started with 408 and 669. 408 was named most, on 89 of them (69%).
- 129unwanted-call complaints named a Sunnyvale code
- 408was named on the most of them, 89
- 69%of the Sunnyvale complaints named 408
Source: Federal Communications Commission, CGB - Consumer Complaints Data (dataset 3xyp-aqkj), issue "Unwanted Calls", read on November 4, 2026. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
This is how you get a Sunnyvale number.
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Start your free week.
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Type the code you picked.
Open Create a number, type the three digits and give the number a name.
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Hand the number out.
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People ask these questions about Sunnyvale area codes.
More in the full FAQ.
Yes. San Jose and Sunnyvale are both covered by 408 and 669.
Sunnyvale was in 415 until 408 was split from it in 1959, and it went with the new code.
A local call in Sunnyvale is dialed with 1 plus ten digits, whichever of its codes the number starts with. The area code is part of every number you give out.
From October 2025 to September 2026, people filed 129 FCC complaints about unwanted calls from numbers that start with a Sunnyvale code: 408 (89) and 669 (40). A complaint is one person's report. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
Yes. You type the area code you want when you create a number, and you do not need to live in Sunnyvale. Calls ring the phone you already have, and texts land in your ExpressNumber inbox.
No. Your numbers are receive-only: they take calls and texts, and they never make them. You answer calls on your own phone, and you cannot reply to a text from the inbox.
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Codes around Sunnyvale
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Every fact on this page comes from public numbering records.
The codes, the places and the years are rows of the North American Numbering Plan Administrator's area code database, and the complaints are the FCC's own.
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