The 820 area code is an overlay serving California’s south-central coast, layered over the 805 code from Ventura County up through Santa Barbara and San Luis Obispo. Introduced in 2019 to supply new phone numbers, 820 covers the exact same territory as 805. If an 820 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 820 at a Glance
| Detail | Information |
|---|---|
| Area Code | 820 |
| State | California (CA) |
| Major Cities | Oxnard, Ventura, Santa Barbara, Thousand Oaks |
| Time Zone | Pacific Time (PT) |
| Country Code | +1 (USA) |
| Overlay Codes | 805 (co-located) |
Geographic Coverage & Major Cities
Area code 820 covers California’s south-central coast, spanning Ventura, Santa Barbara, and San Luis Obispo counties. Because it is an overlay, it shares the identical footprint of the 805 area code rather than covering a separate zone.
Cities and communities served by the 820 area code include:
- Oxnard & Ventura – the largest cities in Ventura County, on the Pacific coast
- Thousand Oaks & Simi Valley – populous inland Ventura County suburbs
- Santa Barbara – the scenic “American Riviera” coastal city
- San Luis Obispo & Santa Maria – the northern reaches of the Central Coast
From beach towns and wine country to university communities, 820 numbers are typically assigned to residents and businesses who obtained phone service after the region’s original 805 numbers grew scarce.
A Brief History of Area Code 820
Area code 820 was activated in 2019 as an all-services overlay on the 805 region. The 805 code was created in 1957 and once stretched across a much larger area; in 1999 the Bakersfield and Santa Clarita areas split off into the new 661 code. An overlay adds a second area code across the same geographic area, so existing 805 customers kept their numbers while new lines could be assigned either 805 or 820. The region uses mandatory 10-digit dialing to keep every number unique.
Time Zone & Best Time to Call
Numbers in the 820 area code use Pacific Time (PT). The region observes Daylight Saving Time, shifting from PST (UTC-8) to PDT (UTC-7) between March and November each year.
How to Dial Phone Numbers in Area Code 820
Because 820 is an overlay of 805, the region requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Always include the area code – 820-XXX-XXXX.
- 11-digit dialing: You can also dial 1-820-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 820 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 820 XXX XXXX
- From any mobile phone worldwide: +1 820 XXX XXXX
Is Area Code 820 a Scam? Safety & Protection Tips
Area code 820 is a legitimate California area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 820, faking the caller ID so their number appears to come from a trusted Central Coast line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
| Package delivery scams | Fake texts or calls about a “failed delivery” with a bad link |
How to report, block, and look up 820 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in California
Area code 820 sits alongside several other Southern and Central California codes:
- 805 – the original Central Coast code that 820 overlays (see our 805 area code guide)
- 661 – Bakersfield and the Santa Clarita Valley, split from 805 in 1999 (see our 661 area code guide)
- 818 & 747 – the San Fernando Valley to the southeast (see our 818 area code guide)
- 310 – the Los Angeles Westside and South Bay (see our 310 area code guide)
Explore more codes across the state on our California area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions About Area Code 820
Where is the 820 area code located?
Area code 820 covers California’s south-central coast, including Oxnard, Ventura, Santa Barbara, and San Luis Obispo. It operates on Pacific Time as an overlay of area code 805.
What is the difference between 820 and 805?
There is no geographic difference. 820 is an overlay covering the exact same area as 805; it was added simply to supply more phone numbers as the Central Coast grew.
Is 820 a landline or cell phone area code?
Both. Area code 820 serves landlines, mobile phones, and VoIP numbers throughout the south-central coast.
Should I answer a call from an unknown 820 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 820 Guides
- Worried about spam or robocalls? Browse our Scam Alerts directory.