Area Code 840
Area code 840 covers Pomona 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
Pomona, San Bernardino, Fontana, Rancho Cucamonga, Ontario, Rialto, Chino, Chino Hills, Upland, Redlands, Diamond Bar, Highland
Area codes by city
- Ontario area codes
- San Bernardino area codes
- Pomona area codes
- Fontana area codes
- Rancho Cucamonga area codes
- Chino area codes
- Redlands area codes
- Chino Hills area codes
- Upland area codes
- Montclair area codes
- Rialto area codes
Carriers in area code 840
Area code 840 spans 121 prefixes, about 63% wireless. Top carriers: T-MOBILE USA, INC., NEW CINGULAR WIRELESS PCS, LLC, ONVOY, LLC - CA, CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA. Look up the carrier for a 840 number.
Other California area codes
- 209 — Stockton
- 213 — Los Angeles
- 279 — Sacramento
- 310 — Compton
- 323 — Los Angeles
- 341 — Oakland
- 350 — Stockton
- 357 — Fresno
- 369 — Santa Rosa
- 408 — San Jose
- 415 — San Francisco
- 424 — Compton
- 442 — Victorville
- 510 — Oakland
- 530 — Marysville
- 559 — Fresno
- 562 — Long Beach
- 619 — San Diego
- 626 — Alhambra
- 628 — San Francisco
- 650 — Palo Alto
- 657 — Anaheim
- 661 — Bakersfield
- 669 — San Jose
- 707 — Santa Rosa
- 714 — Anaheim
- 738 — Los Angeles
- 747 — San Fernando
- 760 — Oceanside
- 805 — Oxnard
- 818 — Van Nuys
- 820 — Camarillo
- 831 — Salinas
- 837 — Redding
- 858 — San Diego
- 909 — Ontario
- 916 — Sacramento
- 925 — Concord
- 949 — Irvine
- 951 — Riverside
Nearby area codes
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.