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840 Area Code

Area Code Overview

Area code 840 is a geographic telephone area code in California that went into service on February 23, 2021. The geographic regions covered by this area code overlay has a population of approximately 2,288,416.

Overlay and Dialing Rules

  • Area Code: 840
  • State: California
  • Type: General Purpose Code
  • In Service Date: February 23, 2021
  • Overlay Complex: 840/909
  • Local Dialing Plan: This area requires you to dial 1 and the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 840

This area code is ranked 316th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 34th out of 39.

1,125,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 840

Total assigned 1,125,000
Wireless
679,000 assigned
60.36%
Wireline and VoIP
400,000 assigned
35.56%
Other / Unclassified
46,000 assigned
4.09%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 840

Estimated assigned wireless phone numbers: 679,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

T-Mobile 254,000 (37.41%)
AT&T Wireless 243,000 (35.79%)
Verizon Wireless 182,000 (26.80%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 840

Estimated assigned wireline and VoIP phone numbers: 400,000

Onvoy 209,000 (52.25%)
Commio 64,000 (16.00%)
Bandwidth 42,000 (10.50%)
Spectrum 36,000 (9.00%)
Telnyx 19,000 (4.75%)
Peerless Network 13,000 (3.25%)
AT&T 8,000 (2.00%)
TERRA NOVA TELECOM INC. 5,000 (1.25%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2,000 (0.50%)
Lumen 1,000 (0.25%)
PAETEC ITEL, LLC 1,000 (0.25%)

Other / Unclassified Assigned Numbering in Area Code 840

Estimated assigned other or unclassified phone numbers: 46,000

FRACTEL, LLC 33,000 (71.74%)
TON80 COMMUNICATIONS, LLC 5,000 (10.87%)
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 4,000 (8.70%)
HD CARRIER LLC 2,000 (4.35%)
BARR TELL USA, LLC 1,000 (2.17%)
EXIANT COMMUNICATIONS LLC 1,000 (2.17%)

Cities and Towns in Area Code 840

Arrowhead, California Big Bear City, California Big Bear Lake, California Calimesa, California Chino, California Claremont, California Colton, California Corona, California Crestline, California Diamond Bar, California Etiwanda, California Fontana, California Hemet, California Highland, California Marshall, California Mentone, California Ontario, California Pomona, California Redlands, California Rialto, California Riverside, California Running Springs, California San Bernardino, California Upland, California Woodcrest, California

These geographic regions are also served by area code 909.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 840, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm