🇺🇸 820 area code
Area code 820 covers Simi Valley, Santa Barbara, Santa Maria and Oxnard and the surrounding area in California. It shares that territory with 805, so the same neighbourhood can have numbers in any of them. Enter an 820 number below for a free check before you call back.
- Location: Simi Valley, California
- Time zone: Pacific (UTC−8)
- In service since June 30, 2018
Consultar un número
Validez, operador, tipo de línea y región en la primera pasada.
Area code 820 at a glance
- Area code
- 820
- Location
- California, United States
- Main cities
- Simi Valley, Santa Barbara, Santa Maria, Oxnard, Camarillo, Thousand Oaks
- Time zone
- Pacific (UTC−8)
- Local time now
- —
- In service since
- June 30, 2018
- Created from
- 805
- Overlay codes
- 805
- Local calls
- Dial 1 + 10 digits
- Number format
- (820) 555-0123
- From abroad
- +1 820 555 0123
Cities in the 820 overlay area
- Simi Valley
- Santa Barbara
- Santa Maria
- Oxnard
- Camarillo
- Thousand Oaks
- Paso Robles
- San Luis Obispo
- Ventura
- Newbury Park
Is a 820 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so an 820 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing an 820 number to people in California because a local-looking call is more likely to be answered. If an 820 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 820
820 entered service on June 30, 2018, as an overlay on 805, which had run short of numbers.
It is part of the 805/820 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 820 overlays the same ground, the cities listed are those of the codes it shares with.
Preguntas frecuentes
Area code 820 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 820?
Area code 820 is in California, United States. It covers Simi Valley, Santa Barbara, Santa Maria, Oxnard, Camarillo and Thousand Oaks.
What time zone is area code 820?
820 is in the Pacific (UTC−8) time zone, and observes daylight saving time.
What area codes overlay 820?
805 serves the same area as 820. Numbers in all of them are local to one another.
When did area code 820 start?
820 entered service on June 30, 2018, created from 805.
How do I find out who called me from 820?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 820?
If you live in or near California, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 820 callers who will not leave a message are best looked up before you call back.
Got a call from 820?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.