Area Code 331

FTC complaints involving 331 numbers

Numbers shown with area code 331 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Other”, “Reducing your debt (credit cards, mortgage, student loans)”, “No Subject Provided”.

Most-complained 331 numbers:

• (331) 888-1773 — 260 complaints
• (331) 888-1940 — 247 complaints
• (331) 248-4967 — 151 complaints
• (331) 888-1662 — 134 complaints
• (331) 888-1953 — 64 complaints

These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.

Frequently asked questions

Where is area code 331?

Area code 331 covers Aurora, Illinois (Central Time) and nearby Naperville, Bolingbrook and Wheaton; overlay 630 shares the same area.

What cities use area code 331?

Area code 331 serves Aurora, Naperville, Bolingbrook, Wheaton, Downers Grove, and 21 other communities in Illinois.

What time zone is area code 331 in?

Area code 331 is in the Central Time (America/Chicago).

How do you dial a 331 number?

Dial all 10 digits: 331 followed by the 7-digit local number. From abroad, dial +1 331 and the local number.

Is a call from area code 331 a scam?

A 331 number is geographically tied to Illinois, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Is 331 a country code?

No. 331 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 331 number written for international dialing looks like +1 331 followed by the 7-digit local number.