Illinois Area Codes

Illinois Area Codes

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Everything You Should Know About Illinois Area Codes

Need to identify or obtain an Illinois-based phone number? This detailed guide 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?

The area code system in Illinois segments regions for organized call routing, helping manage number allocation across cities.

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

Current List of Illinois Area Codes

Here is a breakdown of the current area codes used across Illinois:

• 217 – Covers Springfield, Champaign, and surrounding areas
• 309 – Western central Illinois
• 312 – Central Chicago zone
• 773 – Rest of Chicago outside downtown
• 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 – 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.

Illinois Area Code Search Tools

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

Why Businesses Choose Local Illinois Numbers

Companies looking to reach customers in Illinois often opt for local numbers to boost call pick-up rates and brand visibility.

Modern business platforms make it simple to Cook County area code buy or assign IL-based numbers.

Looking to get started? Check out Bling’s virtual phone numbers today.

Illinois Area Code Overlays

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)

Users must now dial 10 digits, even for local calls, due to overlays.

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

Here’s how the area codes are split by region in Illinois:

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.

Want to learn more? Visit VoIP-powered Illinois business calling for powerful options.

How to Get a Local Number in Illinois

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

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

Explore VoIP number options for Illinois today.

Frequently Asked Questions About Illinois Area Codes

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