Area Code 820
Area code 820 covers San Buenaventura (Ventura) and nearby cities including Oxnard, Thousand Oaks, Simi Valley in California, in the Pacific Time.
Is a call from 820 a scam? Who called me from 820?
Cities in area code 820
San Buenaventura (Ventura), Oxnard, Thousand Oaks, Simi Valley, Santa Maria, Santa Barbara, Camarillo, San Luis Obispo, Lompoc, Atascadero, Goleta, Moorpark
Area codes by city
Other California area codes
- 209 — Stockton
- 213 — Los Angeles
- 279 — Sacramento
- 310 — Los Angeles
- 323 — Los Angeles
- 341 — San Jose
- 350 — Stockton
- 357 — Fresno
- 369 — Santa Rosa
- 408 — San Jose
- 415 — San Francisco
- 424 — Los Angeles
- 442 — Moreno Valley
- 510 — San Jose
- 530 — Chico
- 559 — Fresno
- 562 — Los Angeles
- 619 — San Diego
- 626 — Los Angeles
- 628 — San Francisco
- 650 — San Jose
- 657 — Los Angeles
- 661 — Bakersfield
- 669 — San Jose
- 707 — Santa Rosa
- 714 — Los Angeles
- 738 — Los Angeles
- 747 — Los Angeles
- 760 — Moreno Valley
- 805 — San Buenaventura (Ventura)
- 818 — Los Angeles
- 831 — Salinas
- 837 — Chico
- 840 — Los Angeles
- 858 — San Diego
- 909 — Los Angeles
- 916 — Sacramento
- 925 — San Jose
- 949 — Long Beach
- 951 — Anaheim
Nearby area codes
- 805 — San Buenaventura (Ventura)
- 661 — Bakersfield
- 747 — Los Angeles
- 818 — Los Angeles
- 310 — Los Angeles
- 424 — Los Angeles
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.