Pick 510 if the number should read as Fremont.
The code has been in use since 1991, and Fremont kept it in 1998, when 925 took the east side of the hills.
The area codes for Fremont are 510 and 341.
Area codes in Fremont
Get a phone number with the right area code for Fremont.
Fremont, at the south end of the East Bay, uses 510 and 341. Hayward, Union City and Newark next to it are in the same two codes.
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Pick 510 for Fremont, or 341 if the newer code suits the number.
Pick 341 if you want the second code of the area.
341 entered service in July 2019 and serves Fremont, Newark and Union City just as 510 does.
Pick 408 if your customers are in San Jose, to the south.
408 covers San Jose and most of Santa Clara County, and 669 was laid over it in 2012.
People filed 118 FCC complaints about unwanted calls from Fremont area codes in 12 months.
From October 2025 to September 2026, 118 unwanted-call complaints filed with the FCC gave a caller ID number that started with 510 and 341. 510 was named most, on 88 of them (75%).
- 118unwanted-call complaints named a Fremont code
- 510was named on the most of them, 88
- 75%of the Fremont complaints named 510
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 Fremont number.
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Type the code you picked.
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People ask these questions about Fremont area codes.
More in the full FAQ.
No. Fremont is in Alameda County and uses 510. San Jose, a short way south, uses 408 and 669.
341, which entered service on July 22, 2019, over the same area as 510.
A local call in Fremont 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 118 FCC complaints about unwanted calls from numbers that start with a Fremont code: 510 (88) and 341 (30). 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 Fremont. 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 Fremont
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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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