Browse Illinois area codes and open individual area code pages for location, major cities, time zone, introduction date, overlay or related codes, and dialing information.
About Illinois Area Codes
Area Codes Atlas currently lists 17 published area code pages associated with Illinois. Use the directory above to open each code page and review its location, listed cities, time zone, introduction date, and related or overlay code information. The introduction-year data in the current directory ranges from 1947 to 2023.
Cities Listed for Illinois Area Codes
Cities appearing in the current Illinois area-code records include West Chicago, Addison, Algonquin, Arlington Heights, and Bartlett. The exact cities vary by area code, so open an individual code page for its full city list.
Frequently Asked Questions About Illinois Area Codes
How many Illinois area codes are listed?
Area Codes Atlas currently has 17 published area code pages associated with Illinois.
Which cities are listed for Illinois area codes?
Current records include cities such as West Chicago, Addison, Algonquin, Arlington Heights, Bartlett, and Batavia. City coverage differs by area code, so use the directory above for code-specific details.
How can I find information about a specific Illinois area code?
Select an area code from the directory above. Each code page includes the available location, city, time zone, introduction-date, related-code, and dialing information.
Counts, cities, time zones, and introduction-year summaries on this page are generated from the current published Area Codes Atlas directory and may change as the directory is updated.