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820 Area CodeOxnard, CA

Area code 820 covers Oxnard and 78 other cities in California: 1,556,801 people in 3 counties, led by Ventura and Santa Barbara, on Pacific Time (PT). It overlays 805.

Overview

Major City
Oxnard
State
California (CA)
Timezone
Pacific Time (PT)
Current Time
–:––
Overlay
Yes – shares area with 805

Nearby Area Codes

Where is area code 820?

Overview of the 820 Area Code

Geographic Coverage of the 820 Area Code

All 79 cities

Oxnard Area Codes Overview

What cities does area code 820 cover?

CityStatePopulationPopulation in 820% of listed-city population% of City
OxnardCA200,616200,61614.3%100.0%
Simi ValleyCA125,778125,7788.9%100.0%
Thousand OaksCA124,229124,2298.8%100.0%
Santa MariaCA111,346111,3467.9%100.0%
San Buenaventura (Ventura)CA109,831109,8317.8%100.0%
Santa BarbaraCA87,29187,2916.2%100.0%
CamarilloCA69,88169,8815.0%100.0%
San Luis ObispoCA49,72949,7293.5%100.0%
LompocCA43,59443,5943.1%100.0%
MoorparkCA35,62135,6212.5%100.0%
GoletaCA32,61132,6112.3%100.0%
Santa PaulaCA31,78631,7862.3%100.0%
El Paso de Robles (Paso Robles)CA31,56831,5682.3%100.0%
AtascaderoCA29,74329,7432.1%100.0%
OrcuttCA28,90528,9052.1%100.0%
Isla VistaCA23,09623,0961.6%100.0%
Port HuenemeCA21,32521,3251.5%100.0%
Arroyo GrandeCA18,24918,2491.3%100.0%
FillmoreCA17,21617,2161.2%100.0%
NipomoCA16,71416,7141.2%100.0%
Los OsosCA14,27614,2761.0%100.0%
CarpinteriaCA12,87612,8760.9%100.0%
Grover BeachCA12,53412,5340.9%100.0%
Morro BayCA10,59110,5910.8%100.0%
MontecitoCA8,9658,9650.6%100.0%
GuadalupeCA8,7358,7350.6%100.0%
Pismo BeachCA7,9847,9840.6%100.0%
TempletonCA7,6747,6740.6%100.0%
OjaiCA7,5637,5630.5%100.0%
OceanoCA7,2867,2860.5%100.0%
El RioCA7,1987,1980.5%100.0%
Mira MonteCA6,8546,8540.5%100.0%
Vandenberg VillageCA6,4976,4970.5%100.0%
CambriaCA6,0326,0320.4%100.0%
SolvangCA5,9885,9880.4%100.0%
BuelltonCA5,0235,0230.4%100.0%
Santa YnezCA4,4184,4180.3%100.0%
Oak ViewCA4,0664,0660.3%100.0%
Mission HillsCA3,5763,5760.3%100.0%
Meiners OaksCA3,5713,5710.3%100.0%
Vandenberg AFBCA3,3383,3380.2%100.0%
Santa Rosa ValleyCA3,3343,3340.2%100.0%
Casa ConejoCA3,2493,2490.2%100.0%
Channel Islands BeachCA3,1033,1030.2%100.0%
CayucosCA2,5922,5920.2%100.0%
Lake NacimientoCA2,4112,4110.2%100.0%
Mission CanyonCA2,3812,3810.2%100.0%
San MiguelCA2,3362,3360.2%100.0%
PiruCA2,0632,0630.2%100.0%
Los AlamosCA1,8901,8900.1%100.0%
Avilla BeachCA1,6271,6270.1%100.0%
Lake SherwoodCA1,5271,5270.1%100.0%
Toro CanyonCA1,5081,5080.1%100.0%
Los RanchosCA1,4771,4770.1%100.0%
SummerlandCA1,4481,4480.1%100.0%
ShandonCA1,2951,2950.1%100.0%
CallenderCA1,2621,2620.1%100.0%
Santa MargaritaCA1,2591,2590.1%100.0%
Los OlivosCA1,1321,1320.1%100.0%
Santa SusanaCA1,0371,0370.1%100.0%
SaticoyCA1,0291,0290.1%100.0%
BlacklakeCA9309300.1%100.0%
Los BerrosCA6416410.1%100.0%
WoodlandsCA5765760.0%100.0%
San ArdoCA51700.0%0.0%
New CuyamaCA51700.0%0.0%
BallardCA4674670.0%100.0%
San SimeonCA4624620.0%100.0%
Garden FarmsCA3863860.0%100.0%
LockwoodCA37900.0%0.0%
Oak ShoresCA3373370.0%100.0%
Whitley GardensCA2852850.0%100.0%
EdnaCA1931930.0%100.0%
SisquocCA1831830.0%100.0%
CasmaliaCA1381380.0%100.0%
CrestonCA94940.0%100.0%
BradleyCA93930.0%100.0%
GareyCA68680.0%100.0%
CuyamaCA5700.0%0.0%

City population is shown in full; each city's share inside 820 is measured from Census tract centroids.

What counties does area code 820 cover?

CountyStatePopulation in 820% of area-code footprint% of County
Ventura CountyCA827,26853%98%
Santa Barbara CountyCA447,10929%100%
San Luis Obispo CountyCA282,42418%100%
Sources:

Has area code 820 been reported for unwanted calls?

Yes – 301 FTC complaints, May 29 – Oct 1, 2026.

  • 61% robocalls
  • ↑ 81% vs prior period
  • FTC data, retrieved 2026-10-05

Most-reported subjects

  • Other42%125
  • Calls pretending to be government, businesses, or family and friends23%68
  • Reducing your debt (credit cards, mortgage, student loans)22%65

Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints.

Which prefixes and exchanges belong to area code 820?

5% assigned to a telco

  • 86% Landline
  • 14% Wireless
  • 0% Unknown
PrefixUsageCarrier
(820)200-LandlineAdvanced Telecom Solutions
(820)201-LandlineShelcomm
(820)202-WirelessCsc Wireless
(820)203-WirelessT-Mobile Usa
(820)204-WirelessNew Cingular Wireless Pcs
(820)205-WirelessNew Cingular Wireless Pcs
(820)206-WirelessT-Mobile Usa
(820)207-WirelessNew Cingular Wireless Pcs
(820)208-LandlineTpx Communications
(820)209-LandlineBandwidth.Com Clec
(820)212-WirelessNew Cingular Wireless Pcs
(820)222-LandlineFractel
(820)234-LandlineFractel
(820)280-LandlineHd Carrier
(820)288-LandlineFractel
(820)299-LandlineFractel
(820)300-LandlineOnvoy
(820)333-LandlineFractel
(820)336-LandlineFractel
(820)345-LandlineFractel
(820)346-LandlineFractel
(820)348-LandlineFractel
(820)356-LandlineFractel
(820)380-LandlineOnvoy
(820)386-LandlineFractel
(820)400-LandlineTwilio International
(820)426-LandlineTon80 Communications
(820)432-LandlineFractel
(820)444-LandlineFractel
(820)465-LandlineFractel
(820)500-LandlineFractel
(820)529-LandlineFractel
(820)587-LandlineFractel
(820)600-LandlineFractel
(820)666-LandlineFractel
(820)667-LandlineFractel
(820)732-LandlineFractel
(820)758-LandlineFractel
(820)777-LandlineFractel
(820)786-LandlineFractel
(820)799-LandlineFractel
(820)800-LandlineFractel
(820)822-LandlineFractel
(820)823-LandlineOnvoy
(820)837-LandlineTon80 Communications
(820)842-LandlineFractel
(820)888-LandlineTerra Nova Telecom
(820)899-LandlineFractel
(820)900-LandlineFractel
(820)946-LandlineFractel
(820)999-LandlineFractel

Frequently Asked Questions about the 820 Area Code

Who called me from a 820 number?

14% of its assigned prefixes are wireless. Largest holders: Fractel, New Cingular Wireless Pcs, and Onvoy.

Is 820 a scam area code?

Carriers hold 5% of its possible prefixes.

Why do I keep getting calls from the 820 area code?

Complaints rose 81% on the prior period.

Should I answer an unknown 820 number?

61% of its FTC complaints were robocalls. Its most-reported specific subject was "Calls pretending to be government, businesses, or family and friends", at 23%.

How do I block calls from the 820 area code?

Blocking 820 still lets 805 numbers through.

Where is area code 820?

820 covers 79 cities and 1,556,801 residents in 3 California counties, led by Ventura, Santa Barbara, and San Luis Obispo.

When did area code 820 go into service?

820 went into service on June 30, 2018. It was added to overlay 805.

Is 820 a real area code?

Yes: 13 carriers hold its prefixes, serving 79 cities in Ventura, Santa Barbara, and San Luis Obispo counties.

What timezone is the 820 area code in?

820 is on Pacific Time (PT).

How do I call a 820 number from abroad?

Dial +1 820, then the number.

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