Illinois Area Codes

Complete Guide to Illinois Phone Area Codes

Are you wondering what area code corresponds to your Illinois city? We’ll break it all down for you in this comprehensive post includes everything from historical area code changes to VoIP business solutions

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.

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

Active Area Codes in IL

Below is a current list showing city coverage and overlays:

• 217 – Central Illinois including Springfield
• 309 – Peoria, Bloomington, and western parts of IL
• 312 – Downtown Chicago only
• 773 – Rest of Chicago outside downtown
• 872 – Overlay for 312 and 773
• 847 – Northern suburbs including Evanston
• 224 – Also covers northern suburbs
• 630 – Western suburbs
• 331 – Overlay for 630
• 708 – Southwest Chicago suburbs
• 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.

How to Lookup Illinois Area Codes

There are many reliable lookup tools that help you identify the area code for a city or trace a phone call.

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

Illinois Virtual Numbers for Businesses

Entrepreneurs and service providers rely on local numbers to appear local and trustworthy in customers’ eyes.

Modern business platforms make it simple to buy or assign IL-based numbers.

Looking to get started? Check out Bling’s local number services today.

Illinois Area Code Overlays

To prevent exhaustion of available numbers, Illinois has implemented overlays in many regions.

Here are the main get more info 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.

This flexibility helps businesses scale, reach target markets, and streamline support.

How to Get a Local Number in Illinois

Getting a business phone number with an Illinois area code enhances regional credibility.

For example, Illinois business line instantly connects you with your target region.

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

Frequently Asked Questions About Illinois Area Codes