Comprehensive Guide to Illinois Area Codes

Everything You Should Know About Illinois Area Codes

Are you wondering what area code corresponds to your Illinois city? This detailed guide includes everything from historical area code changes to VoIP business solutions

Whether you're a resident, traveler, or business owner, grasping the phone number structure in Illinois helps with routing calls, marketing, and compliance.

How Illinois Phone Codes Work

The area code system in Illinois segments regions for organized call routing, allowing calls to be directed accurately.

Structured by the NANP, Illinois area codes follow a format shared across the U.S. and Canada. For official standards, visit NANPA’s website.

Current List of Illinois Area Codes

Here is a breakdown of the current area codes used across Illinois:

• 217 – Central Illinois including Springfield
• 309 – Western central Illinois
• 312 – Downtown Chicago only
• 773 – Rest of Chicago outside downtown
• 872 – Covers greater Chicago metro
• 847 – Northern suburbs including Evanston
• 224 – Overlay for 847
• 630 – Western suburbs
• 331 – Overlay for 630
• 708 – Southwest Chicago suburbs
• 815 – Rockford and northern IL
• 779 – Same coverage region
• 464 – Launched to support number exhaustion

To learn more about official overlays and numbering plans, visit the FCC Area Code Resources.

How to Lookup Illinois Area Codes

There are many reliable lookup tools to discover which city Illinois dialing codes an area code belongs to.

1. TrueCaller – Reverse lookup and spam detection
2. Whitepages – Detailed contact search and verification
3. Nomorobo – Great for spam and robocall filtering
4. YouTube: Illinois Area Codes Explained – Helpful visual resource
5. Wikipedia List – See historical and current Illinois codes

Why Businesses Choose Local Illinois Numbers

Companies looking to reach customers in Illinois often opt for local numbers to appear local and trustworthy in customers’ eyes.

With services like Bling Cloud, businesses can instantly activate virtual numbers for any Illinois region.

If you're setting up a professional phone system with a local presence, explore Illinois-based VoIP services from Bling.

New and Duplicate Area Codes in IL

Illinois uses overlay area codes to handle the increasing demand for phone numbers.

These are the current overlays used in Illinois:

• 872 – Overlays 312 and 773 (Chicago)
• 464 – Newest overlay for 708 (Chicago suburbs)
• 224 – Overlays 847 (Northern suburbs)
• 331 – Overlays 630 (Western suburbs)
• 779 – Overlays 815 (Northern Illinois)

Overlay codes don’t replace old ones but coexist in the same region.

Regional Breakdown: Northern, Central, and Southern Illinois Area Codes

Illinois is divided into three primary telephone regions: North, Central, and South.

Northern Illinois

• 312, 773, 872 – Chicago metro|Downtown and metro Chicago
• 847, 224 – Evanston, Waukegan, North Shore|Northern suburbs
• 630, 331 – Naperville, Wheaton, Oak Brook|Western suburbs
• 708, 464 – Cicero, Oak Lawn, South suburbs
• 815, 779 – Rockford, Joliet, Kankakee

Central Illinois

• 217 – Springfield, Urbana, Decatur
• 309 – Peoria, Bloomington, Galesburg

Southern Illinois

• 618 – East St. Louis, Carbondale, Belleville

Illinois Area Codes & VoIP Technology

With the rise of cloud calling, VoIP is becoming the preferred method for phone communication in Illinois.

Whether you're in downtown Chicago or remote southern Illinois, you can now get a local area code with VoIP solutions.

How to Get a Local Number in Illinois

Local numbers are critical for customer trust.

You can register a business phone number with any Illinois code through platforms like Bling.

It’s also scalable for multiple team members and departments.

Frequently Asked Questions About Illinois Area Codes