820 Area Code
Covers Oxnard and nearby communities in California.
(820) 555-0142Area code 820 map
Interactive coverage map for area code 820, centered on Oxnard, California
34.1975, -119.1770
Open in OpenStreetMapArea code 820 coverage map — centered on Oxnard. Shaded area shows the approximate reach around the primary city.
Calls tagged with area code 820 come from Oxnard and nearby communities in California. It reaches roughly 807,000 people across places such as Oxnard, Thousand Oaks, Simi Valley, Santa Maria and more. The region observes Pacific time, so a number like (820) 555-0142 is on that clock right now. On the ground it spans Ventura, Santa Barbara, San Luis Obispo. It shares its territory with the overlay code 805, which sit on the exact same map. Because the 820 region uses more than one area code, you must dial all ten digits — area code included — even for a local call. You do not, however, need to dial a leading 1 for calls within the US and Canada. Keep reading for the current local time in Oxnard, a map of the 820 coverage area, the places it reaches, nearby and overlay codes, and how to tell a real 820 call from a scam.
Cities covered by 820
Cities & neighborhoods
- Oxnard
- Thousand Oaks
- Simi Valley
- Santa Maria
- Santa Barbara
- Camarillo
- San Luis Obispo
- Lompoc
- Atascadero
- Goleta
- Moorpark
- Orcutt
- Paso Robles
- Port Hueneme
- Santa Paula
- Ventura
Counties
- Ventura
- Santa Barbara
- San Luis Obispo
Looking for the broader picture? See all California area codes.
Nearby & overlay area codes
Overlay codes (same area)
These share 820’s geography — a number in either code can be on the same street.
Neighboring codes
Codes for adjacent regions and metros.
Is a call from 820 a scam?
Area code 820 serves Oxnard and the surrounding area, so most calls are ordinary local and business traffic. As everywhere, spam and robocalls do use 820 numbers, frequently by spoofing a local-looking caller ID to boost pickup rates. The area code itself tells you nothing about who is really calling, so judge the call by what's said, not the number.
Red flags to watch for
- Pressure to act right now, or threats of arrest, fines, or service being cut off.
- Requests to pay with gift cards, wire transfer, crypto, or a payment app.
- Asking for passwords, one-time codes, your SSN, or full card/bank numbers.
- A robocall or recording, or a number that won’t let you call back.
When unsure, hang up and call the organization back on a number you look up yourself.
Calling a 820 number from abroad
Every 820 number is a US/Canada +1 number. From a mobile anywhere, the simplest approach is to dial it in international format:
+1 820 555-0142If your phone can’t dial the +, replace it with your country’s exit code, then 1, then the number:
- UK, Germany, France & most of Europe
00 1 820 555-0142 - Australia
0011 1 820 555-0142 - Japan
010 1 820 555-0142 - Mexico
00 1 820 555-0142
Within the US and Canada you don’t need any of this — just dial the ten digits 820 555-0142.
Reverse phone lookup
Check any US or Canada number to see whether it's a working line, which carrier it sits on, whether it's mobile, landline or VoIP, and roughly where it's registered.
Shows carrier, line type and location. Owner name isn't available here.
Results are for personal, informational use only and may not be used for employment, credit, housing or tenant-screening decisions.
Area code 820: frequently asked questions
Where is the 820 area code located?
The 820 area code is located in California, centered on Oxnard. It covers Ventura, Santa Barbara, San Luis Obispo and nearby communities including Oxnard, Thousand Oaks, Simi Valley, Santa Maria, Santa Barbara, Camarillo.
What time zone is 820 in?
Area code 820 is in the Pacific time zone (UTC-8 (PST) / UTC-7 (PDT)). You can see the exact current local time for Oxnard on the live clock above.
What cities use area code 820?
Cities and areas that use 820 include Oxnard, Thousand Oaks, Simi Valley, Santa Maria, Santa Barbara, Camarillo. Its primary city is Oxnard, CA.
Do I need to dial 1 before 820?
For calls within the US, you do not need to dial a leading 1, but you do need all ten digits: 820 plus the seven-digit number. The 820 area requires ten-digit dialing because more than one area code serves it.
Is 820 a toll-free or scam number?
No — 820 is a normal geographic area code for Oxnard, not a toll-free code (toll-free codes are 800, 833, 844, 855, 866, 877 and 888). A 820 number is not inherently a scam, but the code can be spoofed. See the spam-call section above for how to tell.
What are the overlay area codes for 820?
Area code 820 is overlaid by 805, meaning those codes cover the same geographic area.