Area Code 331 – Illinois

Area Code Details

Area Code

331

State / Province

Illinois

Country

United States

Time Zone

CT

IANA Zone

America/Chicago

Country Code

US

Cities & Counties

DuPage County

Naperville, Aurora

Kane County

Elgin

Other Area Codes in Illinois (12)

• 217 — CT
• 224 — CT
• 309 — CT
• 312 — CT
• 618 — CT
• 630 — CT
• 708 — CT
• 773 — CT
• 779 — CT
• 815 — CT
• 847 — CT
• 872 — CT

Nearby Area Codes

• 330 — Ohio (US • ET)
• 334 — Alabama (US • CT)
• 336 — North Carolina (US • ET)
• 325 — Texas (US • CT)
• 337 — Louisiana (US • CT)
• 323 — California (US • PT)

Trading forex? Check our Forex Market Hours tool to see which markets are open right now — live in your local timezone.

Frequently Asked Questions

What time zone is area code 331 in?

Area code 331 is in the CT time zone (America/Chicago). It serves Illinois, United States.

Where is area code 331 located?

Area code 331 covers Illinois in United States. Major cities include Naperville, Aurora, Elgin.

What cities use area code 331?

Cities served by area code 331 include: Naperville, Aurora, Elgin.

What is the current time in area code 331?

The live clock on this page shows the real-time current time for area code 331 (CT time zone). It updates every second.

Is area code 331 in the US or Canada?

Area code 331 is in United States (US), specifically in Illinois.

What other area codes are in Illinois?

Other area codes in Illinois include: 217, 224, 309, 312, 618, 630, 708, 773, 779, 815, 847, 872.

How do I call area code 331 from another time zone?

When calling area code 331, remember it's in the CT time zone. Use the time converter above to find the best time to call.

What counties does area code 331 cover?

Area code 331 covers: DuPage County, Kane County.