What area code is 840?
Here's everything about it.
Instant lookup for the 840 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
840 at a glance
Summary
Cities & regions served by 840
San Bernardino (southwest) (overlay)7 communities on record for 840.
Where 840 sits on the map
Overlay of 909Coverage area
About the 840 region
840 covers San Bernardino (southwest) in California, including Fontana, Pomona, Chino Hills, Claremont and Chino. The code has been in service since 2021.
840 itself is an overlay: it shares its territory with 909 and was introduced when those codes ran low on new number combinations. New lines may receive either code, calls between them are local, and 10-digit dialing is required across the region.
Overlaid on 909.
Who called me from 840?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 840 does not prove the caller is really in the 840 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 840 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 840 number below.
Frequently asked questions
FAQWhat area code is 840?+–
840 is a telephone area code serving San Bernardino (southwest) in California, United States, in service since 2021.
Where is area code 840 located?+–
It covers Fontana, Pomona, Chino Hills, Claremont and Chino in California.
What cities are in area code 840?+–
Major communities on record include Fontana, Pomona, Chino Hills, Claremont and Chino, among others. The code's territory spans the San Bernardino (southwest) region of California.
What time zone is 840?+–
840 observes Pacific (PT), which is UTC−8 / −7 DST and follows daylight saving time.
When did area code 840 start?+–
840 entered service in 2021. Its history: overlaid on 909.
Why does area code 840 exist?+–
840 is an overlay of 909: it covers the exact same territory and was introduced when the original code ran low on new number combinations. New lines may receive either code, calls between them are local, and 10-digit dialing applies.
Is 840 a scam area code?+–
Scam and robocall traffic can use any North American code, 840 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 840 number, and report anything suspicious.
Can I get a 840 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 840 number regardless of where you physically live, although in an overlaid region you may be assigned 909 instead.