Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 837 - California, CA
Area code 837 is a North American Numbering Plan telephone area code serving Area code in northern California in California. It was activated in 1997 .
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Who called me from area code 837?
A call from area code 837 most likely originates from California or elsewhere in California - but caller ID spoofing means the area code alone cannot confirm who called. 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 837 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 837 residents see it.
Report a scam call from 837 Help other 837-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 837 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 837 area code
Area code 837 serves the following 266 communities across 5 counties:
Area codes near 837 (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.
Robocall complaints in area code 837
Live FCC data coming soon. Our automated scraper for FCC consumer-complaint statistics is in build. Once live, this section will show a real monthly trend chart of robocall complaints tied to 837 numbers, refreshed on the FCC's monthly release cadence.
Source will be FCC Consumer Complaint Data.
Recently reported scam numbers in 837
No reports for 837 yet. Be the first - use the “Report a scam call” form below to flag a number you've received. Approved reports appear here alongside FCC-recorded complaints.
How to block 837 spam calls (by carrier)
Getting repeated spam calls from 837 numbers around California, California? You can't legitimately block every 837 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 837 area code
Area codes 530 and 837 are telephone area codes in the North American Numbering Plan (NANP) in northeastern and Northern California. 530 was created in 1997 in an area code split of 916 and 837 was added to the same numbering plan area as an overlay in 2025.
837 area code FAQ: common questions
What area code is 837?
Area code 837 is a North American Numbering Plan area code that serves Area code in northern California in California, primarily including California and surrounding communities. It was activated in 1997.
Where does area code 837 cover?
Area code 837 covers Butte County, Humboldt County, Nevada County, Sierra County, Trinity County, including cities such as Auburn, Chico, Colfax, Davis, Grass Valley, and roughly 261 other communities.
Is 837 a real area code or a scam?
837 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 837 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 837 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 837?
837 shares coverage with overlay code 530. That means new phone numbers issued in the same geographic area may have either area code, and 10-digit dialing is required.
Sources
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