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840 Area Code

Area code 840 serves San Bernardino, Fontana, Ontario, Rancho Cucamonga, Pomona and nearby communities in California. It has been in service since February 23, 2021, when it was split from 909.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use128
Overlay with909
Projected to run out2056
San BernardinoFontanaOntarioRancho CucamongaPomonaRialtoChinoUplandChino HillsRedlandsEastvaleHighlandYucaipaColtonDiamond BarMontclairClaremontSan DimasLa VerneWalnutLoma LindaBloomingtonGrand TerraceBig Bear CityMuscoyCalimesaCrestlineMentoneHighgroveSan BernardinoChino
Cities and towns served by area code 840

Who issues 840 numbers

Mobile 49%VoIP and cable 25%Landline 26%

Share of the 128 prefixes (the three digits after 840) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
T-Mobile32
Fractel26
Onvoy (Sinch)25
AT&T Mobility18
Verizon Wireless13
Bandwidth4
Terra Nova Telecom3
Ton80 Communications2

Cities and towns in area code 840

CityPopulationOther area codes
San Bernardino222,044909
Fontana221,223909
Ontario187,013909
Rancho Cucamonga177,856909
Pomona147,807909
Rialto106,554909
Chino96,957909
Upland79,446909
Chino Hills77,519909
Redlands74,128909
Eastvale70,594909
Highland57,614909
Yucaipa54,953909
Colton53,383909
Diamond Bar51,884909
Montclair37,563909
Claremont35,838909
San Dimas32,978909
La Verne30,178909
Walnut27,316909
Loma Linda25,221909
Bloomington24,324909
Grand Terrace12,936909
Big Bear City12,493909
Muscoy11,402909
Calimesa11,111909
Crestline10,431909
Mentone9,487909
Highgrove7,164909

Got a call from 840?

A 840 number was originally issued in California, but that does not prove the caller is there. 25% of 840 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 128 prefixes in area code 840

Format: (840) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 840

Where is area code 840?
Area code 840 is in California. It covers San Bernardino, Fontana, Ontario, Rancho Cucamonga, Pomona, Rialto and 23 more cities and towns.
What time zone is area code 840?
Area code 840 is in the Pacific time zone.
Is 840 a toll-free number?
No. 840 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 840 share its area with 909?
840 and 909 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 840 run out of numbers?
NANPA's latest forecast projects the 840/909 overlay to exhaust in the first quarter of 2056. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California