Everything You Need to Know About Illinois Phone Area Codes
Everything You Need to Know About Illinois Phone Area Codes
Blog Article
Illinois Area Codes Explained

Trying to understand which area code to use for your business in Illinois? This detailed guide covers all major and minor Illinois Will County area code area codes
From local users to virtual phone system seekers, understanding Illinois’ telephone code system is crucial for communication.
What Are Area Codes in Illinois?
Area codes in Illinois are three-digit numbers assigned to different regions, supporting phone number management for personal and business use.
Administered by the North American Numbering Plan Administration (NANPA),, Illinois codes align with the NANP guidelines used across North America. For official standards, visit NANPA’s website.
Active Area Codes in IL
Here is a breakdown of Illinois area codes organized by coverage area:
- 217 – Central Illinois including Springfield
- 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 – Also covers northern suburbs
- 630 – Western suburbs
- 331 – Used in the same region
- 708 – Oak Lawn, Cicero
- 815 – Spans northern rural regions
- 779 – Same coverage region
- 464 – Newest overlay for Chicago
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 that help you identify the area code for a city or trace a phone call.
- 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 appear local and trustworthy in customers’ eyes.
Modern business platforms make it simple to buy or assign IL-based numbers.
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
To prevent exhaustion of available numbers, Illinois has implemented overlays in many regions.
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
Impact of VoIP on Illinois Numbers
With the rise of cloud calling, VoIP is becoming the preferred method for phone communication in Illinois.
Want to learn more? Visit Illinois VoIP phone solutions for powerful options.
How to Get a Local Number in Illinois
Getting a business phone number with an Illinois area code enhances regional credibility.
For example, Illinois phone number for business instantly connects you with your target region.
Explore get a virtual Illinois number today.
FAQ – Illinois Phone Codes
Which area codes cover Chicago?
872 is an overlay for both.
Illinois city phone lookup?
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.
How to get an Illinois area code number?
VoIP lets you use IL area codes even if you live elsewhere.
What happens if two people have the same area code?
Overlays allow reuse of area codes without conflict.