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Casa de Oro-Mount Helix, CA Area Codes

Casa de Oro-Mount Helix, California (population 19,651) uses area codes 619 and 858.

Area code619
Area code858
Time zonePacific
Local time now…

Casa de Oro-Mount Helix has no telephone exchange of its own in NANPA records; it is served by the El Cajon exchange about 4.3 km away.

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Casa de Oro-Mount Helix and nearby cities in area code 619

Carriers with Casa de Oro-Mount Helix numbers

103 prefixes are assigned to the El Cajon exchange: 36% mobile, 31% VoIP and cable, 33% landline.

CarrierPrefixes
AT&T (Pacific Bell)20
AT&T Mobility17
Verizon Wireless11
Onvoy (Sinch)10
T-Mobile9
Comcast (Xfinity)6
Bandwidth6
Fractel5

Area codes used in Casa de Oro-Mount Helix

Area codePrefixes serving Casa de Oro-Mount HelixMain carriers in this code
61989AT&T (Pacific Bell), AT&T Mobility, T-Mobile
85814AT&T (Pacific Bell), AT&T Mobility, T-Mobile

Casa de Oro-Mount Helix phone number prefixes

Numbers starting with these first six digits were originally assigned to the El Cajon exchange.

Nearby cities in area code 619

Questions

What is the area code for Casa de Oro-Mount Helix, CA?
Casa de Oro-Mount Helix uses 2 area codes: 619 and 858. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is Casa de Oro-Mount Helix in?
Casa de Oro-Mount Helix is in the Pacific time zone.