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820 Area Code

Area code 820 serves Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura and nearby communities in California. It has been in service since June 30, 2018, when it was split from 805.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use98
Overlay with805
Projected to run out2074
OxnardSimi ValleyThousand OaksSanta MariaSan BuenaventuraSanta BarbaraCamarilloSan Luis ObispoLompocGoletaSanta PaulaEl Paso de RoblesOrcuttAtascaderoEastern Goleta ValleyStevenson RanchPort HuenemeCastaicArroyo GrandeNipomoFillmoreIsla VistaGrover BeachUniversity of California-Santa BarbaraGuadalupeMontecitoTempletonPismo BeachCalifornia Polytechnic State UniversityOjaiMira MonteOceanoVandenberg VillageEl RioOak ViewSolvangBuelltonOxnardSanta MariaSanta BarbaraSan Luis ObispoLompoc
Cities and towns served by area code 820

Who issues 820 numbers

Mobile 33%VoIP and cable 21%Landline 46%

Share of the 98 prefixes (the three digits after 820) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Fractel32
AT&T Mobility18
Onvoy (Sinch)14
T-Mobile8
Verizon Wireless5
Commio3
Boost Subscriberco L.L.C.2
Twilio2

Cities and towns in area code 820

CityPopulationOther area codes
Oxnard199,651805
Simi Valley124,861805
Thousand Oaks122,230805
Santa Maria111,390805
San Buenaventura109,914805
Santa Barbara86,422805
Camarillo68,652805
San Luis Obispo50,636805
Lompoc43,315805
Goleta32,401805
Santa Paula31,774805
El Paso de Robles31,626805
Orcutt31,284805
Atascadero29,464805
Eastern Goleta Valley29,411805
Stevenson Ranch21,317805
Port Hueneme20,987805
Castaic18,479805
Arroyo Grande18,123805
Nipomo17,266805
Fillmore16,937805
Isla Vista13,717805
Grover Beach12,456805
University of California-Santa Barbara11,634805
Guadalupe8,846805
Montecito8,823805
Templeton8,608805
Pismo Beach7,911805
California Polytechnic State University7,529805
Ojai7,474805
Mira Monte7,301805
Oceano7,098805
Vandenberg Village6,793805
El Rio6,343805
Oak View5,984805
Solvang5,944805
Buellton5,158805

Got a call from 820?

A 820 number was originally issued in California, but that does not prove the caller is there. 21% of 820 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 98 prefixes in area code 820

Format: (820) 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 820

Where is area code 820?
Area code 820 is in California. It covers Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura, Santa Barbara and 31 more cities and towns.
What time zone is area code 820?
Area code 820 is in the Pacific time zone.
Is 820 a toll-free number?
No. 820 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 820 share its area with 805?
805 and 820 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 820 run out of numbers?
NANPA's latest forecast projects the 805/820 overlay to exhaust in the third quarter of 2074. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California