| District of Illinois area codes: 224 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 224-523 | Kane | Elgin, IL | T-mobile Usa |
| 224-531 | Cook | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless |
| 224-532 | Cook | Wheeling, IL | New Cingular Wireless PCS |
| 224-533 | Lake | Deerfield, IL | First Communications LLC |
| 224-534 | Cook | Chicago, IL | Paetec Communications |
| 224-535 | Kane | Elgin, IL | AT&T Local |
| 224-538 | Lake | Waukegan, IL | Sprint Spectrum L.p. |
| 224-541 | Lake | Grayslake, IL | Ameritech Illinois |
| 224-542 | Cook | Wheeling, IL | Ameritech Illinois |
| 224-543 | Lake | Half Day, IL | Broadwing Communications |
| 224-544 | Lake | Lake Forest, IL | Ameritech Illinois |
| 224-545 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 224-548 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 224-552 | Lake | Lake Forest, IL | Ameritech Illinois |
| 224-554 | Cook | Schaumburg, IL | Teleport Communications America |
| 224-558 | Cook | Arlington Heights, IL | Sprint Spectrum L.p. |
| 224-563 | Cook | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless |
| 224-565 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 224-567 | Cook | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless |
| 224-568 | Lake | Round Lake, IL | Mcimetro Access Transmission Services LLC |
There are 292 prefixes, In the code area, the major cities are Algonquin, IL;Arlington Heights, IL;Buffalo Grove,. The major city is Chicago.