Illinois Phone Number Lookup

Frequently Asked Questions

What Area Codes Are in Illinois?

Illinois is served by 17 area codes: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872. Each area code covers a specific geographic region within the state and is assigned to cities and towns in that area. The number of area codes in a state reflects its population and telecommunications demand. Illinois has 9,126 active phone prefixes spread across 871 cities. When you receive a call from an unfamiliar number, the first three digits — the area code — tell you which part of Illinois the call likely originated from. You can search any of these area codes on 411FCC to identify the owner of a specific phone number.

How Do I Look Up a Phone Number in Illinois?

Enter the full 10-digit phone number into the search box at the top of this page and click Search. 411FCC returns available information including the registered owner's name, location, phone carrier, and whether the number is wireless, landline, or VoIP. The lookup works for all 17 area codes in Illinois and covers numbers from all major carriers. Results appear within seconds. 411FCC has maintained phone number records since 2003 and covers every US state and Canadian province, so you can search numbers from Illinois or any other jurisdiction using the same tool.

What Phone Carriers Operate in Illinois?

Phone service in Illinois is provided by multiple wireless and landline carriers. The largest providers by number of assigned prefixes include T-mobile Usa, Inc., Onvoy, Llc, New Cingular Wireless Pcs, Llc - Il, Illinois Bell Tel Co, Cellco Partnership Dba Verizon Wireless - Il. Approximately 40% of phone prefixes in Illinois are classified as wireless, with the remaining 60% being landline or VoIP. When you perform a reverse phone lookup on 411FCC, the results include the carrier name for the number you searched, helping you identify whether the call came from a major national carrier or a smaller regional provider.