Identify unknown callers from Monterey, California (831 area code)
ABOUT THIS AREA CODE
California
Pacific Time Zone
Residents in 831 area
UNDERSTANDING 831 CALLS
If you received a call from a number starting with (831), it likely originates from the Monterey, California area, home to approximately 700,000 people. Area code 831 is in the Pacific time zone, so legitimate business calls typically occur during standard business hours.
However, modern technology allows scammers to "spoof" any area code, making calls appear to come from Monterey when they may originate anywhere in the world. A call from a 831 number does not guarantee the caller is actually in California.
The most reliable way to identify who called you from a 831 number is to search the full 10-digit phone number using our lookup tool above. We check public records, carrier databases, and community spam reports.
For more on how phone lookup technology works, read our guide on how reverse phone lookup works.
COMMON CALLER TYPES
Automated systems make millions of calls daily using spoofed local numbers. If you answer a robocall from a 831 number, hang up immediately. How to stop robocalls →
Scammers spoof area code 831 to appear local and trustworthy. Just because a call shows a 831 number doesn't mean it originates from Monterey. About spoofing →
Many calls from 831 are legitimate — doctor's offices, pharmacies, schools, and businesses in Monterey use this area code. Search the number above before assuming it's spam.
Real government agencies in California may call from 831 numbers, but they will never demand immediate payment or threaten arrest over the phone. Warning signs →
SCAM ALERTS
These scam types are frequently reported from 831 numbers. Scammers spoof local numbers, so calls may originate elsewhere.
Caller claims to be from the IRS demanding immediate tax payment or threatening arrest. The real IRS contacts you by mail first. Learn more →
Caller claims your computer is infected or your account is compromised. They want remote access to install malware or steal data. Learn more →
Automated call about your vehicle's extended warranty expiring. This is the most common robocall scam in America. Learn more →
Stay Safe: Never share personal information with incoming callers. If suspicious, hang up and search the number above. Is this a scam call? →
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WHAT TO DO NEXT
Step 1: Don't call back. If you missed the call, do not return it until you've identified the number. Some scams rely on you calling back premium-rate numbers. Read about callback scams to understand why.
Step 2: Search the number. Enter the full 10-digit number in our search tool above. We'll check public records, carrier information, and community reports.
Step 3: Check for voicemail. Legitimate callers leave voicemail. Scammers rarely do, or they leave urgent automated messages designed to create panic.
Step 4: Block and report. If the number is spam, block it and report it to the FTC at reportfraud.ftc.gov.
Step 5: Register on Do Not Call. Add your number to the National Do Not Call Registry at donotcall.gov.
FREQUENTLY ASKED QUESTIONS
Calls from area code 831 originate from the Monterey, California region, serving approximately 700,000 residents. The caller could be a local business, medical office, school, government agency, or a scammer spoofing a local number.
Not all calls from 831 are scams. Area code 831 is a legitimate code serving Monterey and surrounding areas. However, scammers frequently spoof local area codes. Search the number before calling back.
Block specific 831 numbers on your phone, use a call-blocking app or hardware blocker, and register on the Do Not Call Registry at donotcall.gov.
Do not call back unknown numbers from 831 or any area code without first searching them. Learn about callback scams and why returning unknown calls can be costly.
Report scam calls from 831 numbers to the FTC at reportfraud.ftc.gov, the FCC, and your phone carrier.
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