Everything You Should Know About Illinois Area Codes
Are you wondering what area code corresponds to your Illinois city? You’ve come to the right place—this blog covers all major and minor Illinois area codes
From local users to virtual phone system seekers, grasping the phone number structure in Illinois helps with routing calls, marketing, and compliance.
What Are Area Codes in Illinois?
Illinois telephone area codes identify specific geographic territories, supporting phone number management for personal and business use.
Administered by the North American Numbering Plan Administration (NANPA),, Illinois area codes follow a format shared across the U.S. and Canada. For official standards, visit NANPA’s website.
Illinois Area Code List
Find all the active codes below of the current area codes used across Illinois:
- 217 – Central Illinois including Springfield
- 309 – Western central Illinois
- 312 – Central Chicago zone
- 773 – Rest of Chicago outside downtown
- 872 – Covers greater Chicago metro
- 847 – North Chicago suburbs
- 224 – Overlay for 847
- 630 – Western suburbs
- 331 – Overlay for 630
- 708 – Southwest Chicago suburbs
- 815 – Spans northern rural regions
- 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.
Illinois Area Code Search Tools
You can use online tools to discover which city an area code belongs to.
- 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
Using Illinois Phone Codes for Business Presence
Businesses operating in or targeting Illinois use local area codes to establish trust, improve response rates, and localize presence.
Modern business platforms make it simple to buy or assign IL-based numbers.
Looking to get started? Check out Bling’s virtual number options today.
New and Duplicate Area Codes in IL
Many IL area codes now have overlays due to high population and business growth.
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)
Overlay codes don’t replace old ones but coexist in the same region.
Regional Breakdown: Northern, Central, and Southern Illinois Area Codes
Phone area codes in Illinois website follow regional distributions across the state.
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
Impact of VoIP on Illinois Numbers
VoIP lets you use any area code in Illinois without a physical presence.
Whether you're in downtown Chicago or remote southern Illinois, you can now get a local area code with VoIP solutions.
Buying an Illinois Local Business Number
Local numbers are critical for customer trust.
For example, get an Illinois-based number instantly connects you with your target region.
Explore virtual phone numbers in Illinois today.
FAQ – Illinois Phone Codes
What is the area code for Chicago?
Downtown Chicago uses 312 while 773 is for outer districts.
How can I search Illinois area codes?
Use tools like TrueCaller, Whitepages, or check Wikipedia’s Illinois area code list.
Did Illinois add any new codes?
It launched to prevent number shortages.
Is it possible to buy a local IL number?
Yes! Use platforms like Bling to get an instant virtual Illinois number.
What happens if two people have the same area code?
Callers must dial all 10 digits to connect.