Area Code 820
Area code 820 is in California, USA , spanning 4 counties and serving 53 cities, including Oxnard, Ventura or Santa Maria; it currently uses 81 prefixes, assigned from 820-200-XXXX through 820-999-XXXX.
In service since June 30, 2018, area code 820 is an overlay Numbering Plan Area, part of overlay complex 805/820.
The current local time is .
For exact NPA boundaries see official 820 area code map
Phone number lookup
More California area codes:
Locate any 820-NXX prefix:
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 820-200 | Thousand Oaks | 6/25/2018 |
| 820-201 | Oxnard | 7/31/2018 |
| 820-202 | San Luis Obispo | 2/13/2020 |
| 820-203 | Atascadero | 3/11/2021 |
| 820-204 | Camarillo | 7/1/2021 |
| 820-205 | Newbury Park | 7/1/2021 |
| 820-206 | Paso Robles | 7/16/2021 |
| 820-207 | Camarillo | 7/29/2021 |
| 820-208 | Atascadero | 6/29/2022 |
| 820-209 | Gaviota | 2/16/2022 |
| 820-210 | Camarillo | 05/01/2023 |
| 820-212 | Ventura East | 6/1/2022 |
| 820-213 | Camarillo | 05/01/2023 |
| 820-214 | Newbury Park | 05/04/2023 |
| 820-215 | Newbury Park | 05/04/2023 |
| 820-216 | Arroyo Grande | 05/16/2023 |
| 820-217 | Atascadero | 06/06/2023 |
| 820-218 | Lompoc | 07/20/2023 |
| 820-219 | Conejo | 08/11/2023 |
| 820-220 | Piru | 08/11/2023 |
| 820-221 | Santa Maria | 10/26/2023 |
| 820-222 | Camarillo | 1/23/2019 |
| 820-223 | Santa Barbara | 12/07/2023 |
| 820-224 | Nipomo | 12/29/2023 |
| 820-225 | Guadalupe | 01/11/2024 |
| 820-226 | El Rio | 03/21/2024 |
| 820-227 | Santa Maria | 03/29/2024 |
| 820-228 | Lompoc | 07/05/2024 |
| 820-229 | Santa Barbara | 08/27/2024 |
| 820-230 | Paso Robles | 08/27/2024 |
| 820-231 | Camarillo | 09/12/2024 |
| 820-232 | Newbury Park | 09/17/2024 |
| 820-233 | San Luis Obispo | 09/23/2024 |
| 820-234 | Oxnard | 9/17/2020 |
| 820-235 | Ventura | 11/07/2024 |
| 820-236 | Santa Barbara | 11/13/2024 |
| 820-237 | Atascadero | 12/16/2024 |
| 820-238 | Camarillo | 12/30/2024 |
| 820-239 | Newbury Park | 01/06/2025 |
| 820-240 | Santa Barbara | 02/12/2025 |
| 820-280 | Los Alamos | 10/2/2019 |
| 820-288 | Ventura East | 1/27/2021 |
| 820-299 | Camarillo | 1/27/2021 |
| 820-300 | Guadalupe | 1/15/2019 |
| 820-333 | Thousand Oaks | 1/23/2019 |
| 820-336 | Guadalupe | 3/12/2021 |
| 820-345 | El Rio | 7/2/2020 |
| 820-346 | Arroyo Grande | 11/16/2020 |
| 820-348 | Oxnard | 1/11/2021 |
| 820-356 | Point Mugu | 1/13/2021 |
| 820-380 | Pismo Beach | 11/18/2022 |
| 820-386 | Simi Valley | 5/31/2022 |
| 820-400 | Parkfield | 1/15/2019 |
| 820-426 | Camarillo | 2/18/2022 |
| 820-432 | Newbury Park | 8/5/2021 |
| 820-444 | Newbury Park | 1/25/2019 |
| 820-465 | Oxnard | 7/10/2020 |
| 820-500 | Gaviota | 12/5/2019 |
| 820-502 | Simi Valley | 12/05/2023 |
| 820-529 | Piru | 12/17/2019 |
| 820-587 | Santa Barbara | 8/23/2021 |
| 820-600 | Pismo Beach | 12/5/2019 |
| 820-666 | San Luis Obispo | 1/24/2019 |
| 820-667 | Oxnard | 8/5/2021 |
| 820-732 | Ventura | 7/10/2020 |
| 820-758 | Santa Barbara | 7/10/2020 |
| 820-777 | Santa Paula | 1/22/2019 |
| 820-786 | Atascadero | 8/5/2021 |
| 820-799 | Camarillo | 2/23/2022 |
| 820-800 | Cayucos | 12/5/2019 |
| 820-822 | Oxnard | 9/22/2021 |
| 820-823 | Santa Ynez | 01/31/2023 |
| 820-837 | Oxnard | 1/10/2022 |
| 820-842 | Oakview | 11/4/2020 |
| 820-850 | Fillmore | 04/12/2023 |
| 820-888 | Simi Valley | 12/24/2018 |
| 820-899 | Santa Maria | 1/13/2021 |
| 820-900 | Bradley | 12/5/2019 |
| 820-946 | Santa Maria | 7/10/2020 |
| 820-998 | Atascadero | 06/13/2024 |
| 820-999 | Oxnard | 1/22/2019 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date.
- NXX prefixes last updated: March 1st, 2025
Cities in area code 820
| City1 | County | Time Zone2 |
|---|---|---|
| Arroyo Grande | San Luis Obispo | P |
| Atascadero | San Luis Obispo | P |
| Avila Beach | San Luis Obispo | P |
| Bradley | Monterey | P |
| Brandeis | Ventura | P |
| Buellton | Santa Barbara | P |
| Camarillo | Ventura | P |
| Cambria | San Luis Obispo | P |
| Carpinteria | Santa Barbara | P |
| Casmalia | Santa Barbara | P |
| Cayucos | San Luis Obispo | P |
| Creston | San Luis Obispo | P |
| Fillmore | Ventura | P |
| Goleta | Santa Barbara | P |
| Grover Beach | San Luis Obispo | P |
| Guadalupe | Santa Barbara | P |
| Harmony | San Luis Obispo | P |
| Lompoc | Santa Barbara | P |
| Los Alamos | Santa Barbara | P |
| Los Olivos | Santa Barbara | P |
| Los Osos | San Luis Obispo | P |
| Moorpark | Ventura | P |
| Morro Bay | San Luis Obispo | P |
| Newbury Park | Ventura | P |
| Nipomo | San Luis Obispo | P |
| Oak Park | Ventura | P |
| Oak View | Ventura | P |
| Oceano | San Luis Obispo | P |
| Ojai | Ventura | P |
| Oxnard | Ventura | P |
| Paso Robles | San Luis Obispo | P |
| Piru | Ventura | P |
| Pismo Beach | San Luis Obispo | P |
| Point Mugu Nawc | Ventura | P |
| Port Hueneme | Ventura | P |
| Port Hueneme Cbc Base | Ventura | P |
| San Luis Obispo | San Luis Obispo | P |
| San Miguel | San Luis Obispo | P |
| San Simeon | San Luis Obispo | P |
| Santa Barbara | Santa Barbara | P |
| Santa Margarita | San Luis Obispo | P |
| Santa Maria | Santa Barbara | P |
| Santa Paula | Ventura | P |
| Santa Ynez | Santa Barbara | P |
| Shandon | San Luis Obispo | P |
| Simi Valley | Ventura | P |
| Solvang | Santa Barbara | P |
| Somis | Ventura | P |
| Summerland | Santa Barbara | P |
| Templeton | San Luis Obispo | P |
| Thousand Oaks | Ventura | P |
| Ventura | Ventura | P |
| Westlake Village | Ventura | P |
- Listed above are most places served by USA area code 820. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- P stands for Pacific Time (currently ).