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 dives into lookup tools, city-based breakdowns, and more.

From local users to virtual phone system seekers, grasping the phone number structure in Illinois helps with routing calls, marketing, and compliance.

How Illinois Phone Codes Work

Illinois telephone area codes identify specific geographic territories, allowing calls to be directed accurately.

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

Below is a current list showing city coverage and overlays:

• 217 – Central Illinois including Springfield
• 309 – Peoria, Bloomington, and western parts of IL
• 312 – Central Chicago zone
• 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 – Oak Lawn, Cicero
• 815 – Spans northern rural regions
• 779 – Overlay for 815
• 464 – Launched to support number exhaustion

To learn more about official overlays and numbering plans, visit the FCC Area Code Resources.

How to Lookup Illinois Area Codes

Several trusted databases 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

Businesses operating in or targeting Illinois use local area codes to appear local and trustworthy in customers’ eyes.

With services like Bling Cloud, businesses can instantly activate virtual numbers for any Illinois region.

If you're setting up a professional phone system with a local presence, explore business phone systems from Bling.

Overlay Area Codes in Illinois

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)

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

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

Impact of VoIP on Illinois Numbers

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.

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.

Illinois Area Code: Common Questions Answered

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