Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 840 - California, CA
Area code 840 is a North American Numbering Plan telephone area code serving Area codes in southern California, United States in California. It was activated in 1992 and today covers roughly 1.7 million residents across 28 cities and towns, primarily in Los Angeles County .
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Who called me from area code 840?
A call from area code 840 most likely originates from California or elsewhere in California - but caller ID spoofing means the area code alone cannot confirm who called. Right now, 13 840 numbers carry scam reports on this page. The only reliable way to identify the caller is to check the full 10-digit number:
- Run the number through the reverse phone lookup at the top of this page to see the owner's name, carrier, and location.
- Compare it against the recently reported scam numbers in 840 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 840 residents see it.
Report a scam call from 840 Help other 840-area residents - takes 20 seconds, no signup
Reports are reviewed by our team before appearing on the page. The highest-reported numbers get added to the “Recently reported scam numbers” list above with a “community” badge.
Should I answer a call from a 840 number? Take the 30-second quiz - 5 questions, verdict + advice
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Next step: run a reverse-phone lookup on the number to see everything public about it.
Cities in the 840 area code
Area code 840 serves the following 28 communities across 3 counties:
Area codes near 840 (overlay + neighboring)
If a caller ID shows one of these codes, the call is probably still from the California area or a nearby region. Click any code to see its own page.
840 area code robocall complaints (FCC data)
Monthly count of FCC complaints tagged to numbers in area code 840 over the last 12 months.
13 complaints in the last 12 months. That's about 95% fewer robocall complaints per capita than the US average - 1 per 100,000 residents vs a national average of 14.7.
Source: FCC Consumer Complaint Data (dataset vakf-fz8e). Data as of August 8, 2026. Refreshed monthly.
How 840 area code spam calls arrive
Based on 13 FCC complaints in the last 12 months, here's how 840 spam calls reached recipients:
FCC Consumer Complaint Data, last 12 months as of August 8, 2026. Refreshed monthly. Note: the FCC dataset labels method (Live Voice / Prerecorded / SMS) but does not classify scam type (IRS impersonation, tech support fraud, etc.) - those come from community reports.
Recently reported scam numbers in 840
Numbers reported to the FCC or by our community in the last 12 months. Click any to run a full reverse-phone lookup.
Source: FCC Consumer Complaint Data, last 12 months as of August 8, 2026. Refreshed monthly. Numbers submitted via the report form near the top of this page get added here with a “community” badge after moderation.
How to block 840 spam calls (by carrier)
Getting repeated spam calls from 840 numbers around California, California? You can't legitimately block every 840 call without also missing legitimate ones from California, California - so the practical fix is to turn on your carrier's free spam filter and register on the national do-not-call list. Step-by-step for each major US carrier below.
AT&T
- Download the free AT&T ActiveArmor app (iOS + Android).
- Sign in with your wireless number.
- Enable Fraud Blocking and Suspected Spam Warning.
- To block a specific number, tap the call in your history → Block.
Verizon
- Download the free Verizon Call Filter app (iOS + Android).
- Sign in with your Verizon account.
- Turn on Spam Filter.
- To block a specific number: My Verizon → Blocks → Add Number.
T-Mobile
- Download the free Scam Shield app (iOS + Android).
- Enable Scam Block (blocks known scam calls silently).
- Use Scam ID to see “Scam Likely” caller ID on suspicious numbers.
- To block a specific number, dial
#662#from your device.
All carriers
- Register on the FTC's National Do-Not-Call list.
- Report unwanted calls to the FCC at fcc.gov/complaints.
- On iPhone: Settings → Phone → Silence Unknown Callers.
- On Android: Phone app → ⋮ → Settings → Caller ID & spam.
Sources: carrier support pages (AT&T, Verizon, T-Mobile), FCC consumer guides. Free features as of 2026. Every one of these steps costs nothing.
History of the 840 area code
state of California. Area code 909 was created on November 14, 1992, in an area code split of 714 and 840 was added to the numbering plan area to form an overlay complex, effective February 23, 2021. While most of western Riverside County today uses Area code 951, some residents in Eastvale and Corona were allowed to keep the 909 area code after the split in 2004.
840 area code FAQ: common questions
What area code is 840?
Area code 840 is a North American Numbering Plan area code that serves Area codes in southern California, United States in California, primarily including California and surrounding communities. It was activated in 1992.
Where does area code 840 cover?
Area code 840 covers Los Angeles County, Riverside County, San Bernardino County, including cities such as Claremont, Glendora, La Verne, Pomona, San Dimas, and roughly 23 other communities.
Is 840 a real area code or a scam?
840 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 840 numbers because the code is well-known and appears local to millions of residents. Always verify the specific number, not the area code.
How do I block 840 spam calls?
You cannot legitimately block an entire area code without also blocking legitimate calls from California. Better options: register on the National Do-Not-Call list, enable your carrier's spam-filter (all major US carriers now offer this free), and report unwanted calls to the FCC at fcc.gov/complaints so they show up in the trend data on this page.
What's the overlay area code for 840?
840 shares coverage with overlay code 909. That means new phone numbers issued in the same geographic area may have either area code, and 10-digit dialing is required.
Sources
Or explore reverse-phone lookup for any US number.