820 Area Code — California
820 is a North American Numbering Plan area code for California, the United States. It covers about 1,470,151 people in 43 towns and 110 ZIP codes, including Oxnard, Santa Maria and Santa Barbara.
| Field | Value |
|---|---|
| Area code | 820 |
| Country | United States (+1) |
| State / province | California |
| Type | Shares its towns with 805 |
| Time zone | Pacific |
| Population covered | 1,470,151 |
| Towns covered | 43 |
| ZIP codes | 110 |
| Approx. centre | 34.656, -119.837 |
Where area code 820 is used
Area code 820 is assigned to California, the United States, inside the North American Numbering Plan. Numbers in the code are written (820) NXX-XXXX at home and +1 820 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 805. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 820
The 43 towns below are the largest in the 820 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Oxnard | Ventura County | 213,176 | 7 |
| Santa Maria | Santa Barbara County | 145,655 | 5 |
| Santa Barbara | Santa Barbara County | 136,942 | 17 |
| Simi Valley | Ventura County | 128,600 | 5 |
| Ventura | Ventura County | 115,630 | 8 |
| Camarillo | Ventura County | 82,539 | 3 |
| Thousand Oaks | Ventura County | 78,232 | 3 |
| San Luis Obispo | San Luis Obispo County | 64,905 | 8 |
| Lompoc | Santa Barbara County | 59,297 | 3 |
| Goleta | Santa Barbara County | 52,934 | 4 |
| Paso Robles | San Luis Obispo County | 45,554 | 2 |
| Newbury Park | Ventura County | 43,472 | 2 |
Counties covered
| County | ZIP codes |
|---|---|
| Ventura County | 42 |
| Santa Barbara County | 38 |
| San Luis Obispo County | 28 |
| Monterey County | 2 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 820
- Within North America: 820 + 7-digit number (820-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 820, then the 7-digit number — for example 00 1 820 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 820?
820 is a North American Numbering Plan area code assigned to California, the United States. It covers about 1,470,151 people in 43 towns.
Is 820 a US or Canadian area code?
820 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 820 in?
Area code 820 is in the Pacific time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.