New 447 area code to be added in Central Illinois - Mahomet Daily
List of Illinois area codes - Wikipedia
First dial telephones (1930s) | SangamonLink
Marion IL, DHS Offices | DCFOffices.org
Area code 708: Deadline to start 10-digit-dialing for local phone numbers is Sunday | WGN Radio 720 - Chicago's Very Own
Illinois Phone Numbers - Local Area Codes 217, 224, 309, 312, 331, 618
Illinois (IL) Phone Numbers - Local area codes 217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815, 847 and 872
Illinois Phone Numbers - Local Area Codes 217, 224, 309, 312, 331, 618
New 861 area code is coming to the Illinois 309 area code region
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Illinois Commerce Commission announces new 861 area code for 309 region
Deadline to start dialing local phone numbers with area codes is Sunday | FOX 2
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Illinois gets new telephone area code; 464 added to 708 region starting Friday - Chicago Sun-Times
State of Illinois Telephone Directory Secretary of State, Office of the ...
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Deadline to start dialing local phone numbers with area codes is Sunday | FOX 2
New 861 area code coming to Western Illinois as 309 numbers run out | wqad.com
Start practicing, 10-digit dialing coming to central Illinois
Chicago, IL Local Phone Numbers | Area Codes 312, 773, 708
Illinois area codes - Map, list, and phone lookup
In-Person Appointments
The Digital Research Library of Illinois History Journal™: The History of Chicago / Evanston Telephone Exchanges Including Their Two-Letter Codes and Meanings.
