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Area Code 820 Location & Details

State / Region: California • Country: United States

Major Cities Covered: Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura (ventura), Santa Barbara, Camarillo, San Luis Obispo, Lompoc, Moorpark

Standard Dial Format
+1 (820) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 820?
CaliforniaState Hub →
Country Territory
United States
820 Area Code Time Zone
Pacific
820 Overlay Codes
805

Area Code 820 Geographic Map

Interactive location bounds and coverage area for California (Pacific Timezone)

Lat: 34.68° • Lng: -119.84°
📍 Geographic Center: CaliforniaMap data © OpenStreetMap contributors

Where is Area Code 820 Located?

Telephone area code 820 is assigned to California in United States. It serves cities and metropolitan communities including Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura (ventura), Santa Barbara, Camarillo, San Luis Obispo, Lompoc, Moorpark.

Historical Context & Area Code Overlay Information:820 serves California (United States).

For local and long-distance calls within area code 820, standard 10-digit dialing (820) XXX-XXXX applies.

Who Called Me from Area Code 820?

Received an unknown call, missed call, or text scam from area code 820? Here is how to trace who is calling from 820 area code and verify unknown numbers safely:

1.
Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

2.
Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 820 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 820:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 820 & Dialing Format

When placing a phone call to a number in area code 820, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (820) + 7-digit number.
  • Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 820 + 7-digit number.
  • Do I need to dial area code 820 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 820

Urban centers, census places, and communities within the +1-820 calling area

25 Major Cities Listed
City NameCountyPopulation% of 820 Pop
OxnardVentura County199,65116.6%
Simi ValleyVentura County124,86110.4%
Thousand OaksVentura County122,23010.1%
Santa MariaSan Luis Obispo County111,3909.2%
San Buenaventura (ventura)Ventura County109,9149.1%
Santa BarbaraSanta Barbara County86,4227.2%
CamarilloVentura County68,6525.7%
San Luis ObispoSan Luis Obispo County50,6364.2%
LompocSanta Barbara County43,3153.6%
MoorparkVentura County35,0232.9%
GoletaSanta Barbara County32,4012.7%
Santa PaulaVentura County31,7742.6%
El Paso De Robles (paso Robles)San Luis Obispo County31,6262.6%
AtascaderoSan Luis Obispo County29,4642.4%
Port HuenemeVentura County20,9871.7%
Arroyo GrandeSan Luis Obispo County18,1231.5%
FillmoreVentura County16,9371.4%
CarpinteriaVentura County12,7341.1%
Grover BeachSan Luis Obispo County12,4561.0%
Morro BaySan Luis Obispo County10,6130.9%

Counties Covered by Area Code 820

Geographic county distribution and population coverage across California

County NameTotal Population% of 820 Area% of County
Ventura County833,43162.3%90%
San Luis Obispo County282,15323.3%100%
Santa Barbara County443,08114.4%39%

☎️Area Code 820 Exchange Prefixes & Carriers

Showing 50 of 105 central office 3-digit prefixes and assigned telecom carriers

60% Landline26% Wireless14% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(820) 200-📞LandlineTHOUSAOAKSADVANCED TELECOM SOLUTIONS, LLC06/25/2018
(820) 201-📞LandlineOXNARDSHELCOMM07/31/2018
(820) 202-📱WirelessSNLUSOBSPOCSC WIRELESS, LLC02/13/2020
(820) 203-📱WirelessATASCADEROT-MOBILE USA, INC.03/11/2021
(820) 204-📱WirelessCAMARILLONEW CINGULAR WIRELESS PCS, LLC07/01/2021
(820) 205-📱WirelessNEWBURYPRKNEW CINGULAR WIRELESS PCS, LLC07/01/2021
(820) 206-📱WirelessPASOROBLEST-MOBILE USA, INC.07/16/2021
(820) 207-📱WirelessCAMARILLONEW CINGULAR WIRELESS PCS, LLC07/29/2021
(820) 208-📞LandlineATASCADEROU.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS06/29/2022
(820) 209-💻VoIPGAVIOTABANDWIDTH.COM CLEC, LLC - CA02/16/2022
(820) 210-📱WirelessCAMARILLONEW CINGULAR WIRELESS PCS, LLC05/01/2023
(820) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(820) 212-📱WirelessVNTRA EASTNEW CINGULAR WIRELESS PCS, LLC06/01/2022
(820) 213-📱WirelessCAMARILLONEW CINGULAR WIRELESS PCS, LLC05/01/2023
(820) 214-📱WirelessNEWBURYPRKNEW CINGULAR WIRELESS PCS, LLC05/04/2023
(820) 215-📱WirelessNEWBURYPRKNEW CINGULAR WIRELESS PCS, LLC05/04/2023
(820) 216-📞LandlineARROYOGRNDBOOST SUBSCRIBERCO L.L.C.05/16/2023
(820) 217-📞LandlineATASCADEROBOOST SUBSCRIBERCO L.L.C.06/06/2023
(820) 218-📱WirelessLOMPOCNEW CINGULAR WIRELESS PCS, LLC07/20/2023
(820) 219-📞LandlineCONEJOCOMMIO, LLC08/11/2023
(820) 220-📞LandlinePIRUCOMMIO, LLC08/11/2023
(820) 221-📱WirelessSANTAMARIANEW CINGULAR WIRELESS PCS, LLC10/26/2023
(820) 222-📞LandlineCAMARILLOFRACTEL, LLC01/23/2019
(820) 223-📱WirelessSANBARBARACELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA12/07/2023
(820) 224-📞LandlineNIPOMOCOMMIO, LLC12/29/2023
(820) 225-📱WirelessGUADALUPET-MOBILE USA, INC.01/11/2024
(820) 226-💻VoIPEL RIOONVOY, LLC - CA03/21/2024
(820) 227-📱WirelessSANTAMARIACELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA03/29/2024
(820) 228-💻VoIPLOMPOCTWILIO INTERNATIONAL, INC.07/05/2024
(820) 229-📱WirelessSANBARBARANEW CINGULAR WIRELESS PCS, LLC08/27/2024
(820) 230-📱WirelessPASOROBLESNEW CINGULAR WIRELESS PCS, LLC08/27/2024
(820) 231-📱WirelessCAMARILLOCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA09/12/2024
(820) 232-📱WirelessNEWBURYPRKCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA09/17/2024
(820) 233-📞LandlineSNLUSOBSPOLEAP TELECOM, LLC09/23/2024
(820) 234-📞LandlineOXNARDFRACTEL, LLC09/17/2020
(820) 235-📱WirelessVNTRA CNTLT-MOBILE USA, INC.11/07/2024
(820) 236-📞LandlineSANBARBARANUSO, LLC11/13/2024
(820) 237-📱WirelessATASCADEROT-MOBILE USA, INC.12/16/2024
(820) 238-📱WirelessCAMARILLONEW CINGULAR WIRELESS PCS, LLC12/30/2024
(820) 239-📱WirelessNEWBURYPRKNEW CINGULAR WIRELESS PCS, LLC01/06/2025
(820) 240-📞LandlineSANBARBARAWAVENATION, LLC02/12/2025
(820) 241-📱WirelessATASCADEROT-MOBILE USA, INC.04/25/2025
(820) 242-💻VoIPEL RIOONVOY, LLC - CA09/18/2025
(820) 243-💻VoIPCAMARILLOONVOY, LLC - CA10/02/2025
(820) 244-💻VoIPSANTAMARIAONVOY, LLC - CA10/03/2025
(820) 245-📱WirelessSANTAPAULANEW CINGULAR WIRELESS PCS, LLC10/30/2025
(820) 246-📱WirelessATASCADEROT-MOBILE USA, INC.11/06/2025
(820) 247-💻VoIPNEWBURYPRKONVOY, LLC - CA02/18/2026
(820) 248-💻VoIPSANTAMARIAONVOY, LLC - CA07/24/2026
(820) 280-📞LandlineLOS ALAMOSHD CARRIER LLC10/02/2019

Frequently Asked Questions about Area Code 820

Where is area code 820 located?

Area code 820 is located in California (United States), serving cities like Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura (ventura), Santa Barbara, Camarillo, San Luis Obispo, Lompoc, Moorpark.

What timezone is area code 820?

Area code 820 operates in the Pacific timezone.

What state is area code 820?

Area code 820 is assigned to the state / telecom territory of California.

Is area code 820 a scam or dangerous?

Area code 820 is an official geographic area code for California. However, beware of robocaller spoofing.

California State Area Codes

View complete directory of telephone area codes assigned to California.

Explore California Directory

Get a 820 Business Phone Number

How to acquire a virtual phone number or business line with area code 820 for local customer trust in California.

Get 820 Business Number
🛡️ Scam & Safety Directory

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Overlay & Nearby Area Codes for California

Explore neighboring telecom prefixes sharing geographical boundaries with area code 820.

805
Pacific
Area Code 805
Oxnard, Simi Valley, Thousand Oaks, Santa Maria, San Buenaventura (ventura), Santa Barbara, Camarillo, San Luis Obispo, Lompoc, Moorpark
209
Pacific
Area Code 209
Stockton, Modesto, Tracy, Merced, Manteca, Turlock, Lodi, Los Banos, Ceres, Lathrop
213
Pacific
Area Code 213
Los Angeles, Montebello, Commerce, Vernon
279
Pacific
Area Code 279
Sacramento, Elk Grove, Roseville, Folsom, Rancho Cordova, Citrus Heights, Rocklin, Lincoln, West Sacramento, Loomis
310
Pacific
Area Code 310
Torrance, Inglewood, Carson, Compton, Santa Monica, South Gate, Hawthorne, Redondo Beach, Lynwood, Gardena
323
Pacific
Area Code 323
Los Angeles, South Gate, Montebello, Huntington Park, Bell Gardens, Commerce, Vernon