Area Code 312 – Illinois

Area Code Details

Area Code

312

State / Province

Illinois

Country

United States

Time Zone

CT

IANA Zone

America/Chicago

Country Code

US

Cities & Counties

Cook County

Chicago

Other Area Codes in Illinois (12)

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

Nearby Area Codes

• 313 — Michigan (US • ET)
• 310 — California (US • PT)
• 314 — Missouri (US • CT)
• 309 — Illinois (US • CT)
• 315 — New York (US • ET)
• 308 — Nebraska (US • CT)

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Frequently Asked Questions

What time zone is area code 312 in?

Area code 312 is in the CT time zone (America/Chicago). It serves Illinois, United States.

Where is area code 312 located?

Area code 312 covers Illinois in United States. Major cities include Chicago.

What cities use area code 312?

Cities served by area code 312 include: Chicago.

What is the current time in area code 312?

The live clock on this page shows the real-time current time for area code 312 (CT time zone). It updates every second.

Is area code 312 in the US or Canada?

Area code 312 is in United States (US), specifically in Illinois.

What other area codes are in Illinois?

Other area codes in Illinois include: 217, 224, 309, 331, 618, 630, 708, 773, 779, 815, 847, 872.

How do I call area code 312 from another time zone?

When calling area code 312, 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 312 cover?

Area code 312 covers: Cook County.