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Whether you're verifying a call, identifying an unknown number, or reconnecting with someone, we’ve got you covered. Search confidently knowing our platform is comprehensive, covering every area code in the state, including major ones like 312, 618, and 708.

With accurate and reliable data, you’ll uncover names, locations, and other details linked to any phone number. No matter the county, city, or region, ILNumberLookupdelivers the insights you need with speed, privacy, and precision. Start exploring today!

Illinois Area Codes – Complete List and Guide

With 102 counties and a wide range of populations, Illinois is home to numerous area codes that span major cities, small towns, and rural regions. Whether you’re looking to understand where a call is coming from or simply want to learn more about Illinois area codes, we’ve got you covered.

Below is a comprehensive list of all Illinois area codes, organized in numerical order:

1. 217 area code– Central Illinois (Springfield, Champaign, Decatur).
2. 224 area code– Northern Chicago suburbs (Arlington Heights, Schaumburg).
3. 309 area code– Peoria, Bloomington, Moline.
4. 312 area code– Downtown Chicago + immediate surroundings.
5. 331 area code– Overlay for suburban Chicago (Naperville, Aurora).
6. 618 area code– Southern Illinois (Belleville, Carbondale, East St. Louis).
7. 630 area code– Western Chicago suburbs (Naperville, Oak Brook).
8. 708 area code– Western Chicago suburbs (Oak Park, Cicero).
9. 773 area code– Chicago’s north/south sides (Hyde Park, Pilsen).
10. 815 area code– Northern/western suburbs (Joliet, Rockford).
11. 847 area code– Northern Chicago suburbs (Evanston, Skokie, Barrington).
12. 872 area code– Overlay for the Chicago metro area.
13. 630 area code– (Listed again) Includes Wheaton, Lisle, etc.

All Active Illinois Area Codes & Their Associated Cities

1. 312 Area Code– Chicago (downtown), Near North Side, South Loop, River West, The Loop
2. 217 Area Code– Springfield, Champaign, Decatur, Urbana, Lincoln, Bloomington
3. 630 Area Code– Naperville, Oak Brook, Downers Grove, Wheaton, Lombard, Elmhurst
4. 708 Area Code– Oak Lawn, Cicero, Oak Park, Tinley Park, Homewood, Harvey
5. 773 Area Code– Chicago (north/south), Hyde Park, Rogers Park, Lincoln Park, Pilsen
6. 815 Area Code– Rockford, Joliet, Ottawa, Kankakee, DeKalb, Bloomington
7. 847 Area Code– Evanston, Skokie, Arlington Heights, Schaumburg, Waukegan, Palatine
8. 309 Area Code– Peoria, Bloomington, Moline, Galesburg, Decatur, Quincy
9. 618 Area Code– Belleville, Carbondale, East St. Louis, O'Fallon, Alton, Collinsville
10. 779 Area Code– Rockford, Machesney Park, Freeport, Belvidere (overlay for 815)
11. 872 Area Code– Chicago (overlay for 312 and 773), city & nearby suburbs
12. 331 Area Code– Naperville, Aurora, Elmhurst, Wheaton, Lombard (overlay for 630)
13. 947 Area Code– Novi, Farmington Hills, Troy, etc. (Not typically IL, but included in some references)

Top 10 Illinois Area Codes by Population Served

1. 312 area code– ~2.7 million (downtown Chicago)
2. 773 area code– ~2.7 million (north/south Chicago)
3. 847 area code– ~1.5 million (northern suburbs)
4. 630 area code– ~1.5 million (western suburbs)
5. 708 area code– ~1.4 million (suburban Chicago)
6. 618 area code– ~1.2 million (southern Illinois)
7. 217 area code– ~1.8 million (central Illinois)
8. 630, 331 area code– ~1.5 million (overlay in western suburbs)
9. 309 area code– ~1.2 million (central/western IL)
10. 815 area code– ~1 million (northern Illinois)

Top 30 Cities in Illinois by Population

Below is a list of the top 30 cities in Illinois by population, along with their estimated population and corresponding area codes:

1. Chicago– ~2.7M | Area Codes: 312, 773, 708, 630, 847, 872
2. Aurora– ~200K | Area Codes: 630, 331
3. Naperville– ~148K | Area Codes: 630, 331
4. Joliet– ~150K | Area Codes: 815, 779
5. Rockford– ~150K | Area Codes: 815, 779
6. Springfield– ~115K | Area Codes: 217
7. Peoria– ~115K | Area Codes: 309
8. Elgin– ~110K | Area Codes: 847, 224
9. Champaign– ~90K | Area Codes: 217
10. Waukegan– ~90K | Area Codes: 847, 224
11. Cicero– ~85K | Area Codes: 708
12. Bloomington– ~80K | Area Codes: 309
13. Arlington Heights– ~75K | Area Codes: 847
14. Evanston– ~75K | Area Codes: 847, 224
15. Skokie– ~65K | Area Codes: 847, 224
16. Des Plaines– ~58K | Area Codes: 847
17. Oak Lawn– ~57K | Area Codes: 708
18. Schaumburg– ~75K | Area Codes: 847
19. Tinley Park– ~55K | Area Codes: 708
20. Berwyn– ~55K | Area Codes: 708
21. Moline– ~45K | Area Codes: 309
22. Crystal Lake– ~40K | Area Codes: 815, 779
23. DeKalb– ~40K | Area Codes: 815
24. Carpentersville– ~38K | Area Codes: 847
25. Champaign– ~87K (duplicate listing) | Area Codes: 217
26. Libertyville– ~20K | Area Codes: 847
27. Joliet– ~150K (duplicate listing) | Area Codes: 815
28. Franklin Park– ~20K | Area Codes: 708
29. Wheaton– ~52K | Area Codes: 630
30. Oak Park– ~52K | Area Codes: 708

Top 30 Illinois Counties by Population

Below is a list of the top 30 counties in Illinois, along with their major area codes:

Geography and Demographics of Illinois

Illinois, located in the Midwest, is the 6th most populous state in the United States, with a population of over 12 million residents. Known for its diverse landscapes—fertile plains, rolling hills, forests, and a portion of the Great Lakes coastline—Illinois covers 57,914 square miles, making it the 25th largest state.

Illinois' geographic diversity is matched by its historical significance and economic strength. The state is home to iconic landmarks such as the Willis Tower in Chicago, the Lincoln Home National Historic Site in Springfield, and the Cahokia Mounds in Collinsville. Illinois played a pivotal role in the American industrial economy and continues to be an economic powerhouse in manufacturing, agriculture, and services.

The state’s economy is diverse and robust, with key industries including manufacturing, agriculture, technology, transportation, and finance. Illinois is a major agricultural producer, known for corn, soybeans, and livestock. Chicago, the state’s largest city, is a global financial center, home to major corporations such as Boeing, McDonald's, and Caterpillar, as well as world-class museums, theaters, and universities.

Illinois’ population is highly concentrated in its major metropolitan areas, which drive the state’s economic and cultural identity:

• Chicago-Naperville-Elgin Metro: Over 9.5 million residents, a global hub for business, finance, tech, and culture.
• St. Louis Metro-East (IL portion): Around 350,000 population, with a strong industrial base and a major military presence (Scott Air Force Base).
• Peoria Metro: ~400,000 residents, major center for manufacturing, healthcare, and education.
• Rockford Metro: Over 150,000, known for aerospace, automotive, and machine tool manufacturing.
• Champaign-Urbana Metro: ~200,000, home to the University of Illinois and a thriving research/tech scene.

These major metropolitan areas, along with other significant regions such as Springfield, Bloomington-Normal, and Decatur, form the backbone of Illinois' economy and cultural identity. Whether it’s the financial and tech sectors in Chicago, the agricultural strength in rural areas, or the manufacturing industry in Peoria and Rockford, Illinois continues to thrive as a state of innovation, opportunity, and historical importance.

For official Illinois resources, visit Illinois.govor the Illinois Commerce Commission.

Illinois Quick Facts: Everything You Need to Know

Illinois, the Prairie State, is a land of rich history, diverse culture, and impressive statistics. Whether you're brushing up on trivia or exploring the state’s unique identity, these quick facts provide a snapshot of what makes Illinois so extraordinary.