Area Code 820
Area code 820 covers Camarillo and nearby cities including Oxnard, Thousand Oaks, Simi Valley in California, in the Pacific Time.
Area code 820 quick facts
| Location | Camarillo, California |
|---|---|
| Time zone | Pacific Time |
| In service | 2018-06-30 |
| Overlay codes | 805 |
| Nearby codes | 805, 661, 747, 818, 310, 424 |
| Carrier coverage | 90 prefixes; 52% wireless |
| FTC complaint data | 19 complaints across 6 numbers |
| Data current as of | August 2, 2026 |
Is a call from 820 a scam? Who called me from 820?
FTC complaints involving 820 numbers
Numbers shown with area code 820 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Calls pretending to be government, businesses, or family and friends”, “Other”, “Dropped call or no message”.
Most-complained 820 numbers:
- (820) 600-1227 — 4 complaints
- (820) 222-2349 — 3 complaints
- (820) 223-2228 — 3 complaints
- (820) 204-3851 — 3 complaints
- (820) 732-7588 — 3 complaints
These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.
Cities in area code 820
Camarillo, Oxnard, Thousand Oaks, Simi Valley, Santa Maria, Santa Barbara, San Luis Obispo, Lompoc, Atascadero, Goleta, Moorpark, Orcutt
Area codes by city
- Santa Barbara area codes
- Oxnard area codes
- San Luis Obispo area codes
- Ventura area codes
- Santa Maria area codes
- Simi Valley area codes
- Thousand Oaks area codes
- Paso Robles area codes
- Camarillo area codes
- Lompoc area codes
Carriers in area code 820
Area code 820 spans 90 prefixes, about 52% wireless. Top carriers: NEW CINGULAR WIRELESS PCS, LLC, ONVOY, LLC - CA, T-MOBILE USA, INC., FRACTEL, LLC. Look up the carrier and line type for a 820 number.
Other California area codes
- 209 — Stockton
- 213 — Los Angeles
- 279 — Sacramento
- 310 — Compton
- 323 — Los Angeles
- 341 — Oakland
- 350 — Stockton
- 357 — Fresno
- 369 — Santa Rosa
- 408 — San Jose
- 415 — San Francisco
- 424 — Compton
- 442 — Victorville
- 510 — Oakland
- 530 — Marysville
- 559 — Fresno
- 562 — Long Beach
- 619 — San Diego
- 626 — Alhambra
- 628 — San Francisco
- 650 — Palo Alto
- 657 — Anaheim
- 661 — Bakersfield
- 669 — San Jose
- 707 — Santa Rosa
- 714 — Anaheim
- 738 — Los Angeles
- 747 — San Fernando
- 760 — Oceanside
- 805 — Oxnard
- 818 — Van Nuys
- 831 — Salinas
- 837 — Redding
- 840 — Pomona
- 858 — San Diego
- 909 — Ontario
- 916 — Sacramento
- 925 — Concord
- 949 — Irvine
- 951 — Riverside
Nearby area codes
Frequently asked questions
Where is area code 820?
Area code 820 covers Camarillo and nearby cities including Oxnard, Thousand Oaks, Simi Valley in California, in the Pacific Time.
What cities use area code 820?
Area code 820 serves Camarillo, Oxnard, Thousand Oaks, Simi Valley, Santa Maria, and 11 other communities in California.
What time zone is area code 820 in?
Area code 820 is in the Pacific Time (America/Los_Angeles).
How do you dial a 820 number?
Dial all 10 digits: 820 followed by the 7-digit local number. From abroad, dial +1 820 and the local number.
Is a call from area code 820 a scam?
A 820 number is geographically tied to California, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.
Is 820 a country code?
No. 820 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 820 number written for international dialing looks like +1 820 followed by the 7-digit local number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.