331 Reverse Phone Lookup: Who Called Me?

331 Area Code Spam Calls Reported to FTC

331 area code phone numbers reported to the FTC in the last 30 days:

Phone Number Complaints Last Reported
(331) 306-6506
3
(331) 200-4527
2
(331) 283-6718
2
(331) 373-3294
2
(331) 266-6072
2
(331) 808-9833
2
(331) 808-9929
1
(331) 373-3191
1
(331) 373-3020
1
(331) 319-5807
1

Area Code 331 Scams

The 331 area code is often used for fake legal complaint calls and government impersonation scams. Fraudsters pretend to be officials to scare you into handing over money or personal identification.

Judicial Services / Workplace HR

Extortion attempt threatening to report vague legal complaints directly to the victim's HR or payroll department.

"Claim to have a complaint on file and if I do not address the compliant they will contact my HR payroll at work. Go find a job and stop scamming people that work hard for their money."

IRS / Social Security Administration

Claims an active arrest warrant exists for tax issues and demands SSN verification to freeze activity.

"Officer Andrew Hall said I have an arrest warrant out for me because of suspicious activity on my SS card... need I say more? SCAMMER"

Amazon / Walmart / Apple

Automated calls demanding cancellation confirmation for high-dollar, fake purchases like an iPhone 16 Pro.

"They left a voicemail stating to authorize the payment of $999 for the recent order of Apple iPhone 16 Pro on your account. If you do not authorize this payment, please press 1 to speak to our customer support representative."

Auto Protection Division

Aggressive outbound robocalling selling extended warranties; hangs up if removal from the list is requested.

"These low-lifes call up hoping to sell you auto protection (after your warranty has run out). I don't have an automobile and I have had so many of their calls that I'm nauseous. Tried being dropped from their call list, and the rep hung up on me."

Medical Survey Services

Anonymous prerecorded voice claiming survey responses won't affect coverage to phish for medical history data.

"no company name as to who is calling and leaving a prerecorded message that will only take a few moment of my time and that anything related to my health coverage no matter the answer will not be affected."

General Spam Pingers

Bombards users with 7-10 consecutive silent hang-up calls to verify the line is active.

"I just got 7 calls in row."

Area Code 331 Location: Illinois

Area code 331 covers a significant portion of the western suburbs of Chicago, Illinois. This includes areas within DuPage, Cook, Kane, and Will counties, as well as a small portion of Kendall County.

Counties Served:

  • Cook County
  • DuPage County
  • Kane County
  • Kendall County
  • Will County

Major Cities:

  • Aurora
  • Naperville
  • Elgin (partial)
  • Schaumburg (partial)

Other Cities and Towns:

  • Addison
  • Bartlett
  • Batavia
  • Bensenville
  • Big Rock
  • Bloomingdale
  • Bolingbrook (majority)
  • Boulder Hill
  • Bristol
  • Burr Ridge
  • Campton Hills
  • Carol Stream
  • Clarendon Hills
  • Darien
  • Downers Grove

Overlay System

Area code 331 is an overlay to area code 630 . Area code 630 was created in 1996. Area code 331 was introduced on October 7, 2007, overlaying area code 630. Ten-digit dialing is mandatory in this area.

Who Calls From 331 Phone Numbers?

The western Chicago suburbs - Aurora, Naperville, and Elgin - are served by the 331 area code, a corridor home to major healthcare and research institutions. The Joint Commission surveyors, Fermilab researchers, and Edward-Elmhurst Health schedulers are among the frequent callers.