- This area code is shared by 7 main cities
Champaign (IL)
Charleston (IL)
Danville (IL)
Decatur (IL)
Quincy (IL)
Springfield (IL)
Urbana (IL)
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Illinois, the fifth most populous state in the United States, is served by several area codes that reflect its diverse geography and urban-rural divide. The original area code, 312, was established in 1947, primarily covering the city of Chicago, which remains the state's largest urban center. Over the years, the growing demand for telephone services led to the introduction of additional area codes. Notably, 773 was added in 1996 to alleviate congestion in the Chicago area, while 847 and 224 serve the suburban regions to the north and northwest of the city.
As of 2023, Illinois has multiple area codes, including 217, 309, 618, and 630, each serving different regions, reflecting the state’s significant urban, suburban, and rural populations. The area code 618, for example, encompasses the southern part of the state and includes cities such as Belleville and Carbondale, highlighting the state's diversity.
Telecommunications in Illinois are characterized by a robust infrastructure that supports both landline and mobile services, facilitating communication across its varied terrains from bustling metropolises to quiet rural areas. The state also plays a crucial role in telecommunications trends, given its strategic location and its home to major telecommunication companies and tech hubs. With ongoing developments in technology and infrastructure, Illinois continues to adapt its area codes to meet the evolving needs of its residents and businesses.
Champaign (IL)
Charleston (IL)
Danville (IL)
Decatur (IL)
Quincy (IL)
Springfield (IL)
Urbana (IL)
Algonquin (IL)
Arlington Heights (IL)
Buffalo Grove (IL)
Carpentersville (IL)
Des Plaines (IL)
Elk Grove Village (IL)
Evanston (IL)
Glenview (IL)
Gurnee (IL)
Highland Park (IL)
Hoffman Estates (IL)
Lake Forest (IL)
Lake in the Hills (IL)
Libertyville (IL)
Morton Grove (IL)
Mundelein (IL)
Mount Prospect (IL)
Niles (IL)
North Chicago (IL)
Northbrook (IL)
Palatine (IL)
Park Ridge (IL)
Rolling Meadows (IL)
Round Lake Beach (IL)
Schaumburg (IL)
Skokie (IL)
South Elgin (IL)
Vernon Hills (IL)
Waukegan (IL)
Wheeling (IL)
Wilmette (IL)
Zion (IL)
Bloomington (IL)
East Moline (IL)
East Peoria (IL)
Galesburg (IL)
Moline (IL)
Normal (IL)
Pekin (IL)
Peoria (IL)
Rock Island (IL)
West Chicago (IL)
Addison (IL)
Bartlett (IL)
Batavia (IL)
Bensenville (IL)
Bloomingdale (IL)
Bolingbrook (IL)
Carol Stream (IL)
Darien (IL)
Downers Grove (IL)
Elmhurst (IL)
Glen Ellyn (IL)
Glendale Heights (IL)
Hanover Park (IL)
Lisle (IL)
Lombard (IL)
Naperville (IL)
North Aurora (IL)
Roselle (IL)
Saint Charles (IL)
Streamwood (IL)
Villa Park (IL)
West Chicago (IL)
Westmont (IL)
Wheaton (IL)
Woodridge (IL)
Belleville (IL)
Carbondale (IL)
Collinsville (IL)
East Alton (IL)
East Saint Louis (IL)
Edwardsville (IL)
Granite City (IL)
O’Fallon (IL)
Addison (IL)
Bartlett (IL)
Batavia (IL)
Bensenville (IL)
Bloomingdale (IL)
Bolingbrook (IL)
Carol Stream (IL)
Darien (IL)
Downers Grove (IL)
Elmhurst (IL)
Glen Ellyn (IL)
Glendale Heights (IL)
Hanover Park (IL)
Lisle (IL)
Lombard (IL)
Naperville (IL)
North Aurora (IL)
Roselle (IL)
Saint Charles (IL)
Streamwood (IL)
Villa Park (IL)
West Chicago (IL)
Westmont (IL)
Wheaton (IL)
Woodridge (IL)
Bellwood (IL)
Berwyn (IL)
Blue Island (IL)
Burbank (IL)
Calumet City (IL)
Chicago Heights (IL)
Cicero (IL)
Dolton (IL)
Elmwood Park (IL)
Evergreen Park (IL)
Harvey (IL)
Lansing (IL)
Maywood (IL)
Melrose Park (IL)
Oak Forest (IL)
Oak Lawn (IL)
Oak Park (IL)
Orland Park (IL)
Park Forest (IL)
South Holland (IL)
Tinley Park (IL)
West Chicago (IL)
Belvidere (IL)
Crystal Lake (IL)
DeKalb (IL)
Freeport (IL)
Joliet (IL)
Kankakee (IL)
Loves Park (IL)
Machesney Park (IL)
McHenry (IL)
Rockford (IL)
Romeoville (IL)
Woodstock (IL)
Belvidere (IL)
Crystal Lake (IL)
DeKalb (IL)
Freeport (IL)
Joliet (IL)
Kankakee (IL)
Loves Park (IL)
Machesney Park (IL)
McHenry (IL)
Rockford (IL)
Romeoville (IL)
Woodstock (IL)
Algonquin (IL)
Arlington Heights (IL)
Buffalo Grove (IL)
Carpentersville (IL)
Des Plaines (IL)
Elk Grove Village (IL)
Evanston (IL)
Glenview (IL)
Gurnee (IL)
Highland Park (IL)
Hoffman Estates (IL)
Lake Forest (IL)
Lake in the Hills (IL)
Libertyville (IL)
Morton Grove (IL)
Mundelein (IL)
Mount Prospect (IL)
Niles (IL)
North Chicago (IL)
Northbrook (IL)
Palatine (IL)
Park Ridge (IL)
Rolling Meadows (IL)
Round Lake Beach (IL)
Schaumburg (IL)
Skokie (IL)
South Elgin (IL)
Vernon Hills (IL)
Waukegan (IL)
Wheeling (IL)
Wilmette (IL)
Zion (IL)
Illinois has 12 area codes (331, 630, 224, 847, 618, 708, 779, 815, 309, 217, 312, 773). These area codes are split between cities or states, so if you want to call to Illinois, you need to know exactly where you would like to call.
The first 3 digits to call Illinois may vary depending on where you want to call to, being one or the other depending on the region or city. Take a look at our listing above to find out which area code you need.
Calling Illinois from another state in the United States is considered a long-distance call. Here’s how to make the call: First, dial the area code for Illinois. Each state, and sometimes specific cities within a state, has unique area codes. Then, enter the 7-digit phone number of the person or business you’re trying to reach. If you’re calling from a landline, check with your provider, as long-distance charges may apply. However, most mobile carriers in the U.S. offer nationwide calling without additional fees. Alternatively, you can use VoIP or internet-based calling apps, like Skype, Zoom, or WhatsApp, to bypass traditional long-distance charges. The number you want to reach should look like this: 1-(AreaCode)-111-2222.
When making calls within the United States, dialing +1 depends on several factors. On most modern mobile phones, carriers automatically recognize the country code when calling within the U.S., so dialing +1 is usually not required; you can simply enter the area code followed by the phone number, such as 213-555-1234. If you’re using a landline, dialing 1 (the U.S. country code) before the area code and phone number is often necessary for long-distance calls; for example, calling from one state to another may require dialing 1-213-555-1234. When calling the U.S. from another country, dialing +1 is necessary, so a call from abroad would be formatted as +1-213-555-1234. VoIP and internet-based calling platforms, like Skype and WhatsApp, generally handle country codes automatically, making it unnecessary to dial +1 manually for U.S. numbers.
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