How many area codes does Illinois have?

Illinois has 14 active geographic area codes in the North American Numbering Plan: 217, 224, 309, 312, 331, 618, 630, 708, 730, 773, 779, 815, 847, 872. Each code serves a distinct region or acts as an overlay for a high-demand metro area.

What is the oldest area code in Illinois?

The oldest area code in Illinois is 217, assigned in 1947. It serves Springfield and the Central Illinois region. 217 is one of the original 86 area codes created when the North American Numbering Plan was first established.

Can I get a Illinois phone number from anywhere?

Yes. DialPhone virtual phone numbers are not tied to a physical location. You can get a Illinois area code number and use it from any device — desktop, mobile, or browser — anywhere with an internet connection. This makes Illinois numbers ideal for remote teams, distributed businesses, and sales teams targeting Illinois customers.

How much does a Illinois area code number cost?

DialPhone plans start at $24 per user per month on the Core plan. Every plan includes your choice of Illinois area code number, unlimited US and Canada calling, business SMS, AI call captions, and a free 14-day trial — no credit card required. See the DialPhone pricing page for current tier details.

Can I port my existing Illinois number to DialPhone?

Yes. DialPhone supports free number porting from any major US or Canadian carrier, including existing Illinois area code numbers. Porting typically completes in 2 to 5 business days with zero service interruption. See the complete number porting guide for step-by-step instructions.

What time zones are used in Illinois?

Illinois area codes span the CT time zone. When scheduling calls with Illinois customers, verify the specific area code's time zone to avoid calling outside business hours.

Area Codes in Illinois — Local Business Phone Numbers

Quick answer

Illinois has 14 active geographic area codes covering Chicago, Evanston, Aurora. The most-recognized codes are 217, 618, 312, serving Chicago and the Chicago region.

Total codes: 14
Top metro: Chicago
Time zone: CT
Largest code: 872 (Chicago)

By Darshan M

Growth Operations Lead at DialPhone · Verified against NANPA data

Area codes in Illinois

Illinois is served by 14 active geographic area codes in the North American Numbering Plan. These codes were assigned between 1947 and 2021 as population and call demand grew across the state.

Code	Primary City	Region	Established	Overlay Codes	Population
217	Springfield	Central Illinois	1947	447	800,000
224	Evanston	Northern Chicago Suburbs	2008	847	1,500,000
309	Peoria	West-Central Illinois	1957	—	700,000
312	Chicago	Downtown Chicago	1947	773, 872	500,000
331	Aurora	Western Chicago Suburbs	2007	630	1,200,000
618	East St. Louis	Southern Illinois	1947	—	600,000
630	Aurora	Western Chicago Suburbs	1996	331	1,200,000
708	Cicero	Southern Chicago Suburbs	1989	—	1,200,000
730	Chicago	Southern Chicago Suburbs	2021	708	1,200,000
773	Chicago	Chicago (non-Loop)	1996	312, 872	2,700,000
779	Rockford	Northern Illinois	2007	815	700,000
815	Rockford	Northern Illinois	1957	779	700,000
847	Evanston	Northern Chicago Suburbs	1996	224	1,500,000
872	Chicago	Chicago	2009	312, 773	3,000,000

Time zones in Illinois

All area codes in Illinois fall in the CT time zone.

CT — area codes: 217, 224, 309, 312, 331, 618, 630, 708, 730, 773, 779, 815, 847, 872

Top metros and their area codes

Below are the primary cities in Illinois and the area codes that serve each metro. Cities with multiple codes share geography due to overlay assignments added as demand grew.

Aurora — 331 , 630
Chicago — 312 , 730 , 773 , 872
Cicero — 708
East St. Louis — 618
Evanston — 224 , 847
Peoria — 309
Rockford — 779 , 815
Springfield — 217

Why get a local Illinois number?

A Illinois area code number gives your business three core advantages:

Local trust signal. Customers in Illinois recognize local area codes as their own. A familiar caller ID builds immediate credibility for service businesses, sales teams, and patient communication.
Higher answer rate. Calls from a local area code are answered far more often than toll-free or out-of-area numbers — industry data puts the lift at 20–40%. That difference matters most for outbound sales, appointment confirmations, and service callbacks.
Targeted marketing. Advertising a local Illinois number on print, radio, digital, and outdoor channels converts better than a national 800 number for audiences who prefer doing business locally.

How to get a Illinois area code number with DialPhone

Setting up a Illinois business number takes under 10 minutes:

Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
Search available Illinois numbers. Filter the DialPhone number inventory by state, area code, city, or number pattern.
Choose your number and configure. Assign your new Illinois number to a user or team, configure call routing, voicemail, AI receptionist, and business SMS.
Port your existing number (optional). Already have a Illinois number? Free number porting completes in 2 to 5 business days with zero service interruption.