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925 Area Code

Area code 925 serves Fremont, Concord, Antioch, San Ramon, Livermore and nearby communities in California. It has been in service since March 14, 1998, when it was split from 510.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use640
Projected to run out2051
FremontConcordAntiochSan RamonLivermorePittsburgPleasantonDublinWalnut CreekBrentwoodOakleyDanvilleMartinezPleasant HillLafayetteBay PointOrindaMoragaDiscovery BayClaytonBlackhawkContra Costa CentreCamino TassajaraFremontConcordSan RamonLivermoreBrentwood
Cities and towns served by area code 925

Who issues 925 numbers

Mobile 20%VoIP and cable 28%Landline 51%

Share of the 640 prefixes (the three digits after 925) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Pacific Bell)206
AT&T Mobility48
Verizon Business (MCImetro)48
Lumen (Level 3)46
T-Mobile44
Verizon Wireless38
Tpx Communications37
Onvoy (Sinch)35

Cities and towns in area code 925

CityPopulationOther area codes
Fremont226,442
Concord123,261
Antioch118,958
San Ramon86,209
Livermore83,457
Pittsburg77,542
Pleasanton74,556
Dublin71,602
Walnut Creek70,012
Brentwood66,607
Oakley47,583
Danville43,302
Martinez36,849
Pleasant Hill34,017
Lafayette25,313
Bay Point24,065
Orinda19,507
Moraga16,322
Discovery Bay15,243
Clayton10,842
Blackhawk10,404
Contra Costa Centre7,127
Camino Tassajara6,395

Got a call from 925?

A 925 number was originally issued in California, but that does not prove the caller is there. 28% of 925 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 640 prefixes in area code 925

Format: (925) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 925

Where is area code 925?
Area code 925 is in California. It covers Fremont, Concord, Antioch, San Ramon, Livermore, Pittsburg and 17 more cities and towns.
What time zone is area code 925?
Area code 925 is in the Pacific time zone.
Is 925 a toll-free number?
No. 925 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 925 run out of numbers?
NANPA's latest forecast projects area code 925 to exhaust in the third quarter of 2051. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California