Comprehensive Guide to Illinois Area Codes

Comprehensive Guide to Illinois Area Codes

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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 covers all major and minor Illinois area codes

From local users to virtual phone system seekers, knowing the dialing system across IL is essential for seamless contact and verification.

What Are Area Codes in Illinois?

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 codes align with the NANP guidelines used across North America. For official standards, visit NANPA’s website.

Illinois Area Code List

Find all the active codes below showing city coverage and overlays:

• 217 – Covers Springfield, Champaign, and surrounding areas
• 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 – North Chicago suburbs
• 224 – Overlay for 847
• 630 – Covers DuPage County, Naperville, Wheaton
• 331 – Used in the same region
• 708 – Oak Lawn, Cicero
• 815 – Rockford and northern IL
• 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

You can use online tools to discover which city read more 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

Illinois Virtual Numbers for Businesses

Companies looking to reach customers in Illinois often opt for local numbers 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 phone numbers today.

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)

Each overlay covers the same geographic region as the original area code.

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

Phone area codes in Illinois 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

Illinois Area Codes & VoIP Technology

VoIP lets you use any area code in Illinois without a physical presence.

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

Buying an Illinois Local Business Number

It also helps with branding, geo-targeting, and customer service.

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

You don’t need to be in Illinois physically—virtual systems handle routing through VoIP or PBX networks.

Frequently Asked Questions About Illinois Area Codes

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