Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 831 - Santa Cruz, CA
Area code 831 is a North American Numbering Plan telephone area code serving Area code for Monterey, Salinas and Santa Cruz, California in California. It was activated in 1998 .
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Who called me from area code 831?
A call from area code 831 most likely originates from Santa Cruz or elsewhere in California - but caller ID spoofing means the area code alone cannot confirm who called. Right now, 25 831 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 831 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 831 residents see it.
Report a scam call from 831 Help other 831-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 831 number? Take the 30-second quiz - 5 questions, verdict + advice
Runs entirely in your browser - nothing is sent or stored.
Next step: run a reverse-phone lookup on the number to see everything public about it.
Where is the 831 area code? Coverage map
The pin marks Santa Cruz, the largest city served by area code 831. Zoom and pan to explore the coverage region.
Interactive map. Click a pin for city details. Data © OpenStreetMap contributors.
Cities in the 831 area code
Area code 831 serves the following 64 communities across 3 counties:
Area codes near 831 (overlay + neighboring)
If a caller ID shows one of these codes, the call is probably still from the Santa Cruz area or a nearby region. Click any code to see its own page.
831 area code robocall complaints (FCC data)
Monthly count of FCC complaints tagged to numbers in area code 831 over the last 12 months.
Source: FCC Consumer Complaint Data (dataset vakf-fz8e). Data as of August 9, 2026. Refreshed monthly.
How 831 area code spam calls arrive
Based on 45 FCC complaints in the last 12 months, here's how 831 spam calls reached recipients:
FCC Consumer Complaint Data, last 12 months as of August 9, 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 831
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 9, 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 831 spam calls (by carrier)
Getting repeated spam calls from 831 numbers around Santa Cruz, California? You can't legitimately block every 831 call without also missing legitimate ones from Santa Cruz, 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 831 area code
state of California. The numbering plan area (NPA) comprises Monterey County, San Benito County, and Santa Cruz County. The area code was created in 1998 in an area code split of area code 408.
831 area code FAQ: common questions
What area code is 831?
Area code 831 is a North American Numbering Plan area code that serves Area code for Monterey, Salinas and Santa Cruz, California in California, primarily including Santa Cruz and surrounding communities. It was activated in 1998.
Where does area code 831 cover?
Area code 831 covers Monterey County, San Benito County, Santa Cruz County, including cities such as Salinas, Hollister, Monterey, Santa Cruz, Central Coast, and roughly 59 other communities.
Is 831 a real area code or a scam?
831 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 831 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 831 spam calls?
You cannot legitimately block an entire area code without also blocking legitimate calls from Santa Cruz. 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 831?
831 does not currently have an overlay area code assigned. New numbers in the region are still issued with the 831 prefix.
Sources
Or explore reverse-phone lookup for any US number.