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Alum Rock, CA Area Codes

Alum Rock, California (population 11,619) uses area codes 408 and 669.

Area code408
Area code669
Time zonePacific
Local time now…

Alum Rock has no telephone exchange of its own in NANPA records; it is served by the San Jose exchange about 8.2 km away.

Alum RockSan JoseSalinasSunnyvaleSanta ClaraMilpitasGilroyCupertinoMorgan HillCampbellLos GatosSaratogaEast FoothillsAlum Rock
Alum Rock and nearby cities in area code 408

Carriers with Alum Rock numbers

665 prefixes are assigned to the San Jose exchange: 23% mobile, 26% VoIP and cable, 51% landline.

CarrierPrefixes
AT&T (Pacific Bell)256
AT&T Mobility57
Verizon Wireless55
Onvoy (Sinch)53
T-Mobile40
Verizon Business (MCImetro)34
Lumen (Level 3)27
Spok27

Area codes used in Alum Rock

Area codePrefixes serving Alum RockMain carriers in this code
408544AT&T (Pacific Bell), AT&T Mobility, Verizon Wireless
669121Onvoy (Sinch), T-Mobile, Fractel

Alum Rock phone number prefixes

Numbers starting with these first six digits were originally assigned to the San Jose exchange.

Nearby cities in area code 408

Questions

What is the area code for Alum Rock, CA?
Alum Rock uses 2 area codes: 408 and 669. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is Alum Rock in?
Alum Rock is in the Pacific time zone.