224 is the North American telephone area code for the state of Illinois, including the cities of Algonquin, Arlington Heights, Buffalo Grove, Carpentersville, Des Plaines, Elgin, Elk Grove Village, Evanston, Glenview, Gurnee, Highland Park, Hoffman Estates, Lake Forest, Lake In The Hills, Libertyville, Morton Grove, Mount Prospect, Mundelein, Niles, North Chicago, Northbrook, Palatine, Park Ridge, Rolling Meadows, Round Lake Beach, Schaumburg, Skokie, Vernon Hills, Waukegan, Wheeling, Wilmette, and Zion.
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| Prefix | Primary City | Company | County | Usage |
|---|---|---|---|---|
| 224-200-#### | Arlington Hts, IL | Denali Spectrum License | Unknown | |
| 224-201-#### | Arlington Hts, IL | Denali Spectrum License | Unknown | |
| 224-202-#### | Arlington Hts, IL | Denali Spectrum License | Unknown | |
| 224-207-#### | Libertyville, IL | Cimco Communications | Lake | Landline |
| 224-208-#### | Bartlett, IL | AT&T Local | Du Page | Landline |
| 224-210-#### | Arlington Hts, IL | Sprint Spectrum L.p. | Cook | Cell Number |
| 224-212-#### | Lake Forest, IL | Ameritech Illinois | Lake | Landline |
| 224-213-#### | Northbrook, IL | Cellco Partnership DBA Verizon Wireless | Cook | Cell Number |
| 224-216-#### | Winnetka, IL | New Cingular Wireless PCS | Unknown | |
| 224-217-#### | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless | Cook | Cell Number |
| 224-218-#### | Hampshire, IL | Sbc Internet Services | Kane | Landline |
| 224-220-#### | Chicago, IL | Nextel Communications | Cook | Cell Number |
| 224-221-#### | Northbrook, IL | Denali Spectrum License | Unknown | |
| 224-222-#### | Elk Grove Village, IL | Mci Worldcom Communications | Unknown | |
| 224-223-#### | Northbrook, IL | Denali Spectrum License | Unknown | |
| 224-225-#### | Fox Lake, IL | Sbc Internet Services | Unknown | |
| 224-227-#### | Elgin, IL | Cellco Partnership DBA Verizon Wireless | Unknown | |
| 224-230-#### | Elgin | Cellco Partnership DBA Verizon Wireless - IL | Kane | Unknown |
| 224-232-#### | Arlington Hts, IL | Ameritech Illinois | Cook | Landline |
| 224-233-#### | Skokie, IL | Globalcom-il | Unknown | |
| 224-234-#### | Northbrook, IL | Cellco Partnership DBA Verizon Wireless | Cook | Cell Number |
| 224-235-#### | Northbrook | Sprint Spectrum L.p. | Cook | Unknown |
| 224-236-#### | Bartlett | Bandwidth.com Clec, LLC - IL | Cook | Unknown |
| 224-238-#### | Elgin, IL | Cellco Partnership DBA Verizon Wireless | Kane | Cell Number |
| 224-239-#### | Elgin, IL | Cellco Partnership DBA Verizon Wireless | Unknown | |
| 224-241-#### | Algonquin, IL | New Cingular Wireless PCS | Unknown | |
| 224-243-#### | Fox Lake, IL | New Cingular Wireless PCS | Unknown | |
| 224-244-#### | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless | Unknown | |
| 224-260-#### | Glenview, IL | Nextel Communications | Cook | Cell Number |
| 224-265-#### | Elk Grove Village, IL | Globalcom-il | Cook | Landline |
| 224-267-#### | Antioch, IL | Level 3 Communications | Lake | Landline |
| 224-270-#### | Round Lake, IL | Ameritech Illinois | Lake | Landline |
| 224-276-#### | Elgin, IL | T-mobile Usa | Unknown | |
| 224-277-#### | Northbrook, IL | Cellco Partnership DBA Verizon Wireless | Unknown | |
| 224-279-#### | Wheeling, IL | New Cingular Wireless PCS | Unknown | |
| 224-280-#### | Waukegan, IL | United States Cellular Corp. - Illinois | Lake | Cell Number |
| 224-286-#### | Lake Zurich, IL | Broadwing Communications | Lake | Landline |
| 224-293-#### | Dundee, IL | Ameritech Illinois | Kane | Landline |
| 224-300-#### | Deerfield, IL | Tds Metrocom Inc.-il | Unknown | |
| 224-304-#### | Zion, IL | Ovation Communications Of Illinois | Unknown | |
| 224-305-#### | Northbrook, IL | United States Cellular Corp. - Illinois | Cook | Cell Number |
| 224-306-#### | Northbrook, IL | United States Cellular Corp. - Illinois | Cook | Cell Number |
| 224-320-#### | Lake Zurich, IL | Globalcom-il | Lake | Landline |
| 224-321-#### | Waukegan, IL | Sprint Spectrum L.p. | Unknown | |
| 224-323-#### | Arlington Hts, IL | Denali Spectrum License | Unknown | |
| 224-325-#### | Elgin, IL | Cellco Partnership DBA Verizon Wireless | Unknown | |
| 224-330-#### | Northbrook, IL | Xo Illinois | Cook | Landline |
| 224-333-#### | Algonquin, IL | Comcast Phone Of Illinois DBA Comco | Mchenry | Landline |
| 224-338-#### | Round Lake, IL | Comcast Phone Of Illinois DBA Comco | Unknown | |
| 224-343-#### | Northbrook, IL | Sprint Spectrum L.p. | Unknown |