Area Code 840
Area code 840 covers Los Angeles and nearby cities including San Bernardino, Fontana, Rancho Cucamonga in California, in the Pacific Time.
Is a call from 840 a scam? Who called me from 840?
Cities in area code 840
Los Angeles, San Bernardino, Fontana, Rancho Cucamonga, Ontario, Pomona, Rialto, Chino, Chino Hills, Upland, Redlands, Diamond Bar
Area codes by city
- Los Angeles area codes
- Ontario area codes
- San Bernardino area codes
- Pomona area codes
- Fontana area codes
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
- 820 — San Buenaventura (Ventura)
- 831 — Salinas
- 837 — Chico
- 858 — San Diego
- 909 — Los Angeles
- 916 — Sacramento
- 925 — San Jose
- 949 — Long Beach
- 951 — Anaheim
Nearby area codes
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.