Illinois Area Codes
Illinois Area Codes Explained

Need to identify or obtain an Illinois-based phone number? You’ve come to the right place—this blog dives into lookup tools, city-based breakdowns, and more.
Whether you're a resident, traveler, or business owner, grasping the phone number structure in Illinois is crucial for communication.
How Illinois Phone Codes Work
The area code system in Illinois segments regions for organized call routing, helping manage number allocation across cities.
Supervised by NANPA and the FCC,, Illinois area codes follow a format shared across the U.S. and Canada. For official Illinois toll-free number standards, visit NANPA’s website.
Illinois Area Code List
Below is a current list of the current area codes used across Illinois:
- 217 – Covers Springfield, Champaign, and surrounding areas
- 309 – Western central Illinois
- 312 – Downtown Chicago only
- 773 – Northwest and South Side of Chicago
- 872 – Overlay for 312 and 773
- 847 – North Chicago suburbs
- 224 – Overlay for 847
- 630 – Covers DuPage County, Naperville, Wheaton
- 331 – Used in the same region
- 708 – Southwest Chicago suburbs
- 815 – Rockford and northern IL
- 779 – Overlay for 815
- 464 – Newest overlay for Chicago
To learn more about official overlays and numbering plans, visit the FCC Area Code Resources.
Find Area Codes for Illinois Cities
Several trusted databases to find an Illinois area code by city or number.
- TrueCaller – Reverse lookup and spam detection
- Whitepages – Detailed contact search and verification
- Nomorobo – Great for spam and robocall filtering
- YouTube: Illinois Area Codes Explained – Helpful visual resource
- Wikipedia List – See historical and current Illinois codes
Why Businesses Choose Local Illinois Numbers
Businesses operating in or targeting Illinois use local area codes to boost call pick-up rates and brand visibility.
Using VoIP and virtual phone systems, getting a number with an Illinois area code is now easy and affordable.
Looking to get started? Check out Bling’s virtual number options today.
Illinois Area Code Overlays
To prevent exhaustion of available numbers, Illinois has implemented overlays in many regions.
Here are the main overlays:
- 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)
Users must now dial 10 digits, even for local calls, due to overlays.
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
Voice over IP (VoIP) services have revolutionized how people and businesses use area codes.
Want to learn more? Visit VoIP area code systems in IL for powerful options.
Get a Business Number with an Illinois Area Code
Local numbers are critical for customer trust.
You can register a business phone number with any Illinois code through platforms like Bling.
Explore get a virtual Illinois number today.
Illinois Area Code: Common Questions Answered
Which area codes cover Chicago?
872 is an overlay for both.
How can I search Illinois area codes?
Use tools like TrueCaller, Whitepages, or check Wikipedia’s Illinois area code list.
Are there new area codes in Illinois?
872 and 779 are also recent additions.
Can I get a virtual phone number with an Illinois area code?
Yes! Use platforms like Bling to get an instant virtual Illinois number.
Are Illinois numbers unique per user?
Area codes can overlap, but full 10-digit numbers remain unique.